6nz Jake's not working

I have a 6nz with 340c Jake's and when the engine gets to normal operating temp the Jake's do not work. I can shut it down let it cool down then they work, until the engine is about 175°f, they work but fade as it gets warm then after I run down the road and get it up to 185-190 they completely stop. I have replaced the solinoids, done a "tune up", and replaced the wire harness. I completely disassembled the housings and cleaned/inspected them, the Pistons we're worn but I'm not sure how far they can go. I don't see any obvious oil leaks around the housings when the Jake's kick in and my oil psi is good, 30 idle and 60+ 1400rpm. The engine only has 450k miles and 10k hours but I have no proof of the mileage, it does not use any oil and is very clean inside so I assume I was told correctly. Does anyone have any suggestions? New housing's? New rocker arms due to loose bushings?

 

All new stepped bolts and washers, all the solinoids function and yes I have made a mess pushing the center button on the solinoids while the covers are off. When I had them apart I did notice the slave piston and master piston where wore a bit but not bad, just not new looking. With the Jake's activated I can't really see any abnormal amounts of oil coming out anywhere it's not supposed to, but this is my first time touching Jake's. I don't trust any shops where I'm at and can't afford to loose the truck to take it out of state

 

I will do that when I get in tonight, I know it's something mechanical or an oil loss because I pulled the covers when I got in two days ago an stuck my head where I could see the all three buttons as I reved it and hit the Jake's, all three buttons went in but the Jake did not function. I just don't really know where to look or what is normal for oil loss. I have not had a helper rev the engine while I push the button yet, good idea