RE: riser length
I personally feel that way. That is why I think some of the newer bows shoot as well as a longer one. I have a 35 inch darton and a 30 inch bowtech. However the bowtech has a longer riser than the darton and feels pretty much the same in my hand (actually better).
I think the longer riser gives you more weight over all and more weight at the ends which is basically what a longer ATA bow does for you.
The biggest downfall is the increased string angle at full draw.
These only my opinions though and nothing more.
Paul