LEM... Point being is you need to let them practice. Remember todays F/O is tomorrows CAPT. If you don't let them practice putting it down right place, right speed, ask yourself this: How comfortable are you going to feel when positioning, with them now as CAPT, to somewhere with grotty wx and a short runway, having taken away all their practice?
Heavy landing are one thing, firm ones are acceptable. By the sounds of it you may need to chill a little.
Second point. I have been in the RHS when we had a voilent wing drop in windy weather, experienced training Capt as P/F. I saw where the control column went (correct input) and we landed something like the cloggy 737. Its not nice, not pretty but it happens. How do you know that the Training Capt hadn't taken over as a demo circuit and that happened?