Thanks Jim,
yes, that might have been the problem in a nutshell!
I didn't make any "flat out full throttle" passes, only time the left stick was in "on" position was in a climb, so I didn't go too fast (I think )

As I have a large thrusttube, that closes the rear of the fuselage completely, the only escape for the incoming air, is thru the thrusttube !
So the 1.5" inch hole you have made, that is between the rudder and the exhaust ?

Another one is if the inlets are too small for the P200, but I guess that is not the case ? (could have "sucked" the canopy glass in), one of my friends have problems in a Dragon, when the fuse is closed up (hatch over the front wheel), the fuse is sucked in at full throttle