I had a Havoctec for a while, and sold it to a vet in a wheelchair. He needed it more than I did, but that bow was very easy to shoot well.
There's a lot of factors to consider when making a single bow your entire collection. Unlike wives, or cats, more is better. I have three 33" ATA bows, a Vulcan and two Katera's. They all are easier for me to shoot well than Protec's and Ultratecs I've owned in the past. My Supertec and Turbotec have a 5 3/4" BH, they also shoot as good as anything I've owned in the past. 31" is short, but if it fits you and your style well, it could work.
Tuning and arrow selection are more important than ATA or BH. Get those right, and shooting well is a snap.