A few random points.
Indeed, I think it is universal in aviation to NOT raise the gear until a positive rate of climb is observed.
I think that has more to do with not subsiding back onto the runway during take-off.
The lower prop rpm just feels unnatural to me when thinking of icing conditions. It's back to trusting the software again...don't like it.
That certainly is not much time on type. I usually don't settle down on a new type for at least 300, then I need a lot of empty sectors to really play with it before feeling confident about difficult handling situations.
These days, flight crew are not allowed to do the experimenting that we did. It of course means time in an empty or freight aircraft, and even if it was allowed, there's often not the chance with today's high workload.