RE: increasing draw weight
First its best to get the proper drawlength and poundage on your bow from the get go, and use twisting of the string and cables to maintain your bows timing. If you spin down the string you will shorten the drawlength, shorten the power stroke of the bow. If you spin down the cables it will lengthen the drawlength. All of this can be done, but it is best left to a very qualified bow tech to accomplish. If improperly done it can effect accuracy, change the cable or string lengths you effect bow timing. My suggestion is to purchase a higher poundage bow at the proper draw where you do not sacrafice anything.
Aim Hard!