iam going to install a string loop.... i have 29.5 inch draw lenght do have to shorten up my draw length at all!!!!

Probably. Draw lengths are touchier than most think. I work very hard on setting my draw length. I beleive that it the most important contribution to proper form. You could try and see though. Sometimes the extra can be taken up by adjusting your release. The little bitty goose is good for that as you can custom fit the rease to help make minor adjustments if needed. The only way to find out is to try it out. In my opinion it is worth the trouble.