It sticks. Just how much is too much?

Fairly new to sniping (about 2 wks)Just how liberal can one be with silicon oil w/o it causing problems down the line?

And what is a good grease lubricant safe for these moveable parts?

SSG with WASP piston and m180 spring. Standard hop and bucking (apologize if I am not using correct terms for describing parts).

As I was going thru configurations to see what is optimum, the head on the piston quit wanting to pop out of its cylinder. I use to have to push down (met with resistance) to try and screw the nozzle of the bolt on (part that feeds into the hopup). It'll now stay down making it ALOT easier to assemble. I sometimes have to use a bit of persuasion to remove piston if it has not been fully assembled and fired.

Just as sticking piston started happening, lost around .4J from my heavy cylinder/med brake setup.

Good airseal. 6-7 drops of silicon oil on head from initial assembly. Have cleaned and checked all components.

I want to get back in the neighborhood of 2.68J since I had obtained it prior to trying different air brakes. This happened right after I went back to my hvy/med combo to verify it was indeed the best setup .

Shot the gun this evening, 10 (X5 .43 and X5 .36) all around 2.3J and 340(.43) and 370 FPS.

I'll continue to poke around and find more info, but have not seen anything describing this scenario (yet.....)

Cheers,
BroHay