The speed is the decider on landing the Seneca. Too fast and you'll float forever.
The heavy pitch controls during the flare are the design flaw....
Check speed to the knot, keep a little power on till in the flare, and remember she s heavy on the controls, a little backtrim to assist the holding back is acceptable, as long as you remember the out of trim in case of a go-around.
It works for me every time and my home runway is only 700m grass... Easy!
The only time i embarrassed myself with a prop strike is.... when i floated due to excessive speed coming up to the flare.....!
Seneca IV best of the Seneca's !!!!!