Found an article in stringforum.net about hybrid stringing advice. I think it's quite good. See if any c-hing got a comment.
Quoted as below:
Hybrid Advice for you!
When you hybrid a poly string in the mains with a softer string in the crosses - use the thinnest possible gauge for the CoPoly in the mains and consider going for a CoPoly of the never generation with a TWISTED and edged surface like for instance Signum Pro Tornado, Tecnifibre BlackCode and WeissCannon TurboTwist for extra control, spin and comfort.
Use a thicker gauge for the softer string in the crosses for extra control, tension stability and durability.
When you hybrid Natty GUT in the mains with a poly in the crosses, go for the thinnest possible Natty GUT string, that your wallet can accept. If you don't break string often, consider my favorite Natty GUT string - Babolat VS TEAM 17, best gut string ever made in my view.
The poly you use for the crosses in this hybrid should NOT have an edged or TWISTED surface, because you don't get the spin from cross strings anyway and the TWISTED or edged shape of the CoPoly in the crosses will cut faster into the Natty GUT in the mains thus shortening the overall life of the Natty GUT hybrid. Instead ALWAYS go for a SMOOTH surfaced poly as cross string in a hybrid with Natty GUT mains and preferably of a thicker gauge, because the thicker gauge will not cut into the main Natty GUT strings as fast as a thinner gauge would.
You should also consider using Babolat Elastocross String savers, which will stiffen the string bed up slightly but more than double the durability of the hybrid (I use anything from 48-60 string savers in all my racquets with Natty GUT in them)
GENERAL RULE regarding string tension in hybrids !
You should always look and aim at getting a Constant StringBed Stiffness (CSBS) in your racquet.
Therefore you always string the soft string in a hybrid 2-4 lbs HIGHER than the stiff string in your hybrid - NO MATTER WHERE THE SOFT STRING IS PLACED IN THE HYBRID.
So when you hybrid a poly mains with a Prime Multi crosses, string the poly 2-4 lbs LOWER than the Prime Multi.
When you hybrid Natty GUT mains with a poly crosses, string the Natty gut 2-4 lbs HIGHER than the poly.
先回應第1段先﹔先問点解要hybrid先？用成set poly綫就打得幸苦Ｄ囉，但用成 set synthetic 就冇咁 solid嘞！若將poly用喺 main，咁打出嚟嘅感覺就遍近poly嘅 solid feel但就冇 full set poly咁幸苦嘞ｏ調番轉用 synthetic 16穿 main，而poly穿 cross呢，咁打出係嘅feel就似1 set 15L硬淨嘅SYNTHETIC嘞！
大部份用poly嘅球手都因為鍾意poly比到佢地嘅 solid feel,但多數因poly嘅唯1缺点－傷手，手痛而轉用hybrid。故此Ｄ pro都会因應個人喜好嚟選16或17嘅poly做main( 至於18G就從未見过嘞，可能太易打斷嘞！ ),然後用natural gut做 cross，以達到減震，減低对手嘅傷害，又有最好回彈力而仍保有poly嘅 solid feel嘞！Natural gut 價錢就貴Ｄ，但係值得嘅！
而文中提到筆者唔建議用起角嘅poly做 main可能係因為唔襟用，條 cross synthetic好易比介斷咁話。其實我認為只要用任何poly都会因硬度較高而將synthetic介斷啦，同條poly綫起唔起角関係好细囉！而筆者更建議 cross用粗synthetic呢下野，我就覺得若用粗 cross就只可用條Multi嘞，否則就做唔到 extra control l嘞！Multi綫嘅 stability一向都低啦，除非你做左 pre-stetch啫！至於 durability就欠奉啦，边有咁理想吖，有呢樣就冇個樣啦，老细！
I have tried a set hybird string : main - ISOSPEED Professional 17 String & cross - Toalson Rencon 120 (18L), strung in a Babolat Pure Drive Roddick Plus GT. Good "Ball Feel" and have enough power, easy to handle and not expensive (around $170), also ISOSPEED strings are pre-stretched and can minimizes the loss of tension, you expect play it for 20 hours.
I am quite new to tennis and I have 2 questions to ask.
In general, is natural gut more durable (less easily broken) and hold tension better than multi?
and, is poly string stiffness affected by temperature? I have a full set of signum pro tornado on my yt prestige mp. I feel it quite crisp in summer time but feel like hitting a wooden stick recently. Is it because of the temperature or the string has gone dead?
Soft poly+ multi offers the best variety of games I play the ppl against and what I can do on a court. Unless you are a pro or uses a tour 90. I don't see the reason nowadays to go natural gut. Best players today don't use much nautral gut even most pros don't. Unless you want to be federer
C hing此言差矣！Natural gut嘅回彈回復能力至今都未能為任何 multi filament所能代替，否則以 Natural gut咁貴嘅價錢一早就比人 out咗啦！Best player today still use lots of natural gut，大威用W NATURAL GUT穿 68lb, 5% pre-stretch，John McEnro用法国制BDE N. gut穿50lb, Wozniacki用Yonex poly tour 17直綫，Babolate VS Team pre-stretch10%用喺橫綫穿25 kg, Kafelnikov用 Vs Touch穿28 kg, Mark Philippoussis用Vs Team做直綫，TF Black code 17做 cross穿 25/23 kg。
若果咁都話players today don't use much N. gut, 閣下就真係見識少啦！你同我都係業餘球手，点攞自己嚟倣 standard,然後幻想職業球手都同自己一樣用相同嘅野架！不幸！不幸！
阿C hing真見多識廣嘞，喺90年代頭50名嘅球手中9成係用N. gut！而家則多左用half poly, half gut。而李娜則剛轉用Babolate Pro Huricane做 main,Excel做 cross,磅數係67/65。
阿 C hing七可試轉用半set N. gut,但又平又掂嘅野唔多，可試下英國老牌 Bow Brand，質數唔錯但冇出17 G。若閣下想試下cross用 multi filament的話，可試下德國新牌Weiss Cannon出嘅Xplosive 16,不過要揾有電腦机嘅shop,同埋要指定要pre-stretch 10%(如果佢他肯做嘅話)。好似 X生咁就彩你都儍﹔皆因我見过佢地拉綫時係每次都2條綫黎拉嘅！而 X記雖用靚穿綫機，但係部機嘅夾綫個盤搖搖下嘅，壞壞地嘅架生点会有準確嘅拉力磅數吖！