Can we elminate the decrease in return speed caused by the Nitro Cooler?

No. When using Nitro Cooler with every stroke we have a gas transport between the cooler and gas springs, consequently the return speed will be affected.

With a distance of 1 m between the cooler and gas spring we will have:

0,12m/sec

KF2/KF2-A 1500 & 3000

0,06m/sec

KF2/KF2-A 500 & 7500 return stroke speed.