i have been told once or twice that it is better to concentrate on gaining length before girth because it makes it easier to gain length when your dick is thinner. Is this correct because i dont want to give up any girth gains in order to get the length i want
goin4length, stair step your routine. In other words set a goal of say 1/4- 1/2 length and say 1/8-1/4 girth, once you hit the length goal hit the girth. Work in cycles to gain. If you work length only you will still gain in girth too but to a lesser degree. You are past the beginner phase where you work both at the same time. You can still work both. It's more a matter of looking for what works best for you. I am just suggesting alternatives to try as others do.
mowinman's right, set yourself a goal for length only, then shoot for girth. As for a larger girth hindering length gains for tunica stretching maybe.. but with lig stretching I dont see how it could make a difference coz your only targetting the ligs and not the actual penis tissue.