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I get a loss of power generally about F160 to F240 in ISA condition which results in loss of speed back to M.50 and ROC of about 500fpm then the power comes back on and aircraft accelerates again to normal mach for the climb and climb rate.

I haven't seen this behavior. When you say loss of power do you mean thrust? Like reduced n1 reading?
EPR should be monitored every couple minutes during climb, and increased with altitude as required. If I takeoff with EPR 2.09 , by the time I am at FL240 I might have EPR set to 2.12 (if I'm still climbing).


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I also find that at F270 and above I get rollback and find I have to constantly adjust the power settings to maintain crusie Mach this always results in the beast going up to its speed limit then me bringing the power back again. It sits there normall and then the roll back in the N1 and N2 occurs. (Engine inlet heat and fuel heat ON).

What weather enging do you use? The roll back you're experiencing sounds to me like weather updates (winds). Headwinds/tailwind changes will obviously result in different speeds at the same power setting. Using real weather (REX) I often need to adjust thrust when the weather updates to maintain the best speed/fuel flow or even to avoid overspeed.


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Are the turbine/inlet scalars correct for the mod you have done It all works fine especially on take-off althought I must admist the idle RPM is a little low to my thinking?

The idle thrust is the same as the original FDE (should read about 33% n1 I think?)