In your situation it just isn't gonna happen. You are already looking for ways to shorten your draw length, like twisting up the string. This is going to LOWER your peak draw weight, not raise it.

I hate to say it, but if you want it all you are going to have to start looking for a different bow that fits you and will do what you want it to do.

Depending on the bow you have there are a few ways to increase the draw weight, but it isn't overly safe and I don't feel inclined to tell you how to do it. I got my 60 lb darton up to around 70 lbs once. It's not something I suggest doing though.

Paul