Barb,

otn is on the right track. Some vessels are real pigs in reverse. I have
problems when I have the Folding prop because I have to hit high RPM to
get the blades to open.

When I back out of the Slip, I hold the stern in place with the stern
line until I start to make sternway then I throtle back. Remember You
have a neutral gear. Use it to correct sternwalk, once you get some way.
Use reverse in short pulses and correct in neutral allowing for the next
stern walk under power. KEEP RPM LOW, correct in neutal, curse that cut
away stern and prop and keep trying

Ole Thom