Finally finished faffing around with nozzles, valves, blockers and springs and the MWS. TM nozzles give 45fps LESS than the Guns Modify nozzles....DP aluminium valve adds 100fps over the GM plastic one...two identical valve springs vary by 15fps...
Steel bolt is shooting at 1.08J, spare nozzle gives 1.07J.
Spare Aluminium bolt has a NPAS in so can dial it up or down (and hopefully it won't self adjust!)