RE: adding speed, or new bow
Draw length, draw length, draw length; the first consideration and most important about a compound bow. If you can't get it right then nothing else about the bow matters. Listen to these guys.
BigJ12 is pretty close. You should probably be 28-29", 29" being max unless you got arms like a monkey. Here's is the big rub about going to a "good" proshop---how do you know when you've found one? Especially if you're rather new to archery.
The answer is not all that hard. We just told you the numbers you should be looking for. The other thing to look for is a bow that can be adjusted for draw. Some use modules that change 1" at a time. Others have a rotating module that may cover 3-6", depending on the bow. Martin, Hoyt, and Browning are a couple I can pull of the top of my head.
C'mon guys. There are some others.