I believe the fastest way to up your draw weight is through specific training. The idea of moving up bows in about ten pound increments is the traditional way and has a certain aesthetic appeal. However, it is expensive unless one makes ones own tackle. I've done it by both methods in conjunction. I should say that I have, in the past, done a lot of weight training for contact sports and could pull an 80 pound bow (albeit without much style) from the word go. l won't claim my method's necessarily safe, if you want that shoot a 45Lb'er!
First obtain some means of simulating a bow (I don't think pulleys really cut it as they do not facilitate a fluid draw). here's my bow exerciser and I know it looks like the unholy alliance between a hospital bed and a compound. http://s138.photobucket.com/albums/q280/yeomanbowman/?action=view¤t=Dscn7141.flv
Here are the images of the 'bow exerciser'. It's 6' long and 40mm wide. These are the springs from 'Morris Springs' http://www.morrissprings.co.uk/extension.html
. Go for the ones with longest extension or use shock cord.http://i138.photobucket.com/albums/q280/yeomanbowman/Dscn7118.jpghttp://i138.photobucket.com/albums/q280/yeomanbowman/Dscn7117.jpg
Basically warm up with a lightweight for 15 draws or reps. Over 3 sets increase this weight until it's around 80# (for example) and your nice and warm in the shoulders. Now the heavy stuff begins-put on 100# and rep this weight SMOOTHLY one after another and holding art full draw for as MANY times as possible in good form. In the next few weeks, when you can get 12 reps out add more resistance and try and build the reps back up to 12. Continue this process.
Points to remember
Only do this once a week tops, less if you have shot heavy recently
Small increments can be added with bungee cords
Pre-load the springs to get a more realistic F/D curve.
If you're still sore don't train
Place an arrow/dowel in the bow marked at 32 with a tape stop to ensure full draws.
The same sort of thing can be done holding looped shock-cord, so I'm told.
Hope this helps,