I ran a 85mm exit tube now, it only read 1900 gr on the scale but the thrust on my hand at the back felt quite a bit more than with the 95mm tube, the smaller tube also sucked my hand onto the intake stronger.......I am rather confused with this. I theroy the larger exit tube should give better thrust.
Maybe my way of measuring the static thrust is not all that acurate and this is giving the confusing readings.

Theuns