Sorry, but I don’t think “they run best at 15 ft-lbs” is an explanation.

The FWB Sport’s designed power was around 14. The D34 is rated by M&G at 14.8 (.177”) and 16.2 (.22”), the HW80 16-20. All of those are generally regarded as adequate to excellent in factory 12 ft-lbs trim. What is so different about the 95?