Pete,
What F16 do you have? Sorry I might have missed it? I have a FE F 16 and my main doos sometimes stay open after gear up comand. I think this is due to speed at time of gear up and not enough PSI in tank. I find if I slow the jet the doors close and they then stay closed. The leverage point in the first part of ram travel is not much, but once closed the leverage angle changes and it is able to stay closed. Also I fly with a tad of up on the elevator as well. Oh JR 9711's on elevators bought from Todd!!
the F16 is my first and only scale Jet. I must say I love the way it flies and have no need for any other scale jet!
Mav