This plane is one of the better first gassers next to WH. It seems that GP did their homework on the Performance series planes. I have both the Cap and Ultimate from that line and both are excellent. If you go over to rcuvideos.com and look at the Cap in the pic, that is mine, they just reverse the pic, you can tell if you look at the Cap232 logo on the side, it's backwards. I've attached the original pic for reference

you probably have a bit of up trim in it because of the down thrust which could cause the plane to fall backwards in a hover. Think of it this way, your cruising along at 1/2 throttle, you have a click or two of up trim in it to hold it there. Now you plant the throttle and the plane pulls towards the gear as if you trim did not exist. Same thing pointing straight up. In a hover your probably close to half throttle, your up trim is in there but you are not moving so the trim is forcing the plane over backwards do to airflow from the prop in combination with the trim.

The other thing could be your rudder to elevator mixes. Most people leave it on all the time which is fine for normal/advanced aerobatics, but in a hover that mix can bite you. Try turing off your mix when going into a hover

I cannot hover all that well, so I may be way off base here. I like 3D flight but I'm more of a pattern/IMAC style pilot

I noticed my down thrust problem more in a full power climb but only after the plane started to slow down, which with the DA50 does take a while