Hmm, I don't like the sound of trimming in the flare. I was taught, Trim for Vref speed-somewhere around 76 knots. Then as the throttles come to the idle detent, move both hands on the the control wheel and look ahead (far end of the runway). Using both hands stops the yoke being froced to one side (instead of using one had-that squeeking sound) and reduces the friction required t move it, which coupled with both hands allows a more accurate, smooth flare/touch down. Looking way ahead helps, because it is too easy in the seneca to look close in front and think you have assumed the position (flare) before you have. It also give better peripheral vision perception.
As always I stand to be corrected....
Mr L.