Hello Anthony,
I did not have this kind of issue. What I do usually is to descend to the IAF altitude at 2-3 nm short before. Then, in flight level and reducing the throttles, the speed will gently get down below 175 kts. I set flaps 5 before I am established on the ILS. On the glide, 6-8 nm before the threshold, I deploy the gear and when the speed slows down below 140 kts, I set flaps 20. Then, you should maintain a speed around 120 kts, with a torque about 40% (condition levers in TO position : it helps to decrease the speed of course). When the autopilot is disconnected, I have to trim up the plane and it's often necessary to advance the throttles a little bit. When training on a circuit, I set gear and flaps 5 in rear wind and below 145 kts, I set flaps 20 to get a speed of around 120 kts when entering the base and descend. On the flare, speed decreases quite quickly. So, I reduce the throttles very slowly to idle after passing the threshold, or the plane would fall down in a hard landing.