IMO a big engine will be much heavier, thats gonna raise the wing loading and make her fly faster - it'll be even harder to land in a small area. Big inboard flaps, with lots of drop (40 degrees or more)  used at very low throttle should slow her up and provide a steeper, but slow decent.  You can enhance the effect by fitting leading edge slats which will allow a few more degrees AoA before the stall sets in. With that combo she should drop slow and steep - practically like a parachute.