Al,
You may have answered this already, but have you checked the injector spray patterns?  It is possible that they "click" ok while the fuel orifices are plugged with some gunk.  I took mine and safety wired them to the injector manifold, hooked up a fuel supply, hit them with 12v and observed the spray patterns.  Probably a waste of time, but it would tell you that you're getting a good mix of fuel into each chamber.

Mark;

No I haven’t tested them myself, but sent them off the RC Engineering who cleaned, flow tested and checked the pattern.  There has just been a few hours on the dyno and on the plane, but that doesn’t mean there couldn’t be something in there, although there is a 20 micron filter in the line.  First I need to eliminate any electronic issues.  I’m not sure the pattern is of that much concern on the primary; there is that little plastic deflector below the injector.  I don’t know if the fuel actually sprays on that, or if it just causes some turbulence in the runner right there for better mixing.

BTW, Initially I had incorrectly wired my injector relay.  It took me a while to figure out what I had done wrong and correct it.  I got it wired correctly now... I think.

So did I, but caught that in the first runs on the dyno.

Al