Pump Limit does not have anything to do with acceleration. That fact that your Limit is set at 228 by the factory, tells me you do have the latest and most reliable MTH pump.

You mentioned "mine seems to take forever (almost lost plane on first flight on a trial approach.......)" could it be that you were not used to flying a turbine? I mean it sounds as if you were on idle upon the approach and expect it to accelerate at or towards the end of the runway. Even if an engine will spool up within 2.5 to 4 seconds, it would definitely seemed forever at a close call situation, furthermore, a turbine jet would not have the torque/acceleration response like a 24" prop job, nor thrust to weight ratio.

Apologies in advance if my assessment is false, and if so you are more than welcome to send your K-80 in for an inspection.

Regards,
Barry