ME Spinning
During some air-testing I have spun a number of light twins, including Piper Seneca, Aztec, Islander and some more. The noteworthy thing was that they don't spin well at all, the manufacturers have done well in their designs. Most seem to want to, but as soon as they nose down it just spirals away once you relax the controls. You have to work hard to keep it there, if they stay at all. Most successful were the high wing types, like the Islander. I also had to spin a Cessna 337 (Pushmepullyou) with a grid of lights attached! the CAA were concerned that the grid might cause some unpleasent control problems, there was no problem at all and it span about as well as a 182, ie hardly at all. I would not recomend the use of any power in the spin as it would tend to flatten out the spin, regardless of which side. Remember that the aircraft is pitching up rolling and yawing at the same time, to execute the recovery the idea is to place one of the aircraft axis over the spin axis. The one we use of course is the longitudinal axis and this is why we push the stick foward. Using the rudder then stops the yaw. Some Aircraft are quite exacting and need significant nose down so that the axis alines almost exactly, any power might just prevent this happening as you might find there is insufficient down elevator to compensate. I hope I have been helpful.
Bob