RE: Fod screens impacts
The recent RCJI turbine test issue had an article on this. The authors conclusion was that there was no measurable difference for the turbine size and fod screen he tested. Most turbines monitor rpm as an upper limit for normal full throttle performance and then use egt as the "safety". A fod screeen that adds restriction is only likely to cause the turbine compressor to work harder and add more fuel to reach the same rpm effectively raising egt temps as Henke experienced on his Funjet. I think your fod screen would have to be really restrictive to push the egt's to the point where the ecu was dialling back fuel flow - but then you have the wrong fod screen for your turbine.
If you're really concerned about performance, put the fod screen on and then put your airframe on a diet. Most of the jets I see are over complicated with stuff that are all nice to haves but don't really contribute to the safety or performance and just add weight.
PaulD