Well good luck with it mate, you've put the work in, fingers crossed! I ended up pulling the engine after doing comp tests again...there was a gradual decline in compression form cylinder 4 too 1.. 4 at about 140 psi then 130, 125, and number 1 was struggling for 110...these are probably acceptable reading though i just didn't like it...i done a wet test again on cylinder ! and the compression came back strong...so i figured it wasn't a valve problem..
Now i have it apart, although its a big job, it had to be done...there is a huge amount of carbon build up on top of pistons and valves..
So I am looking for a full gasket kit, rings, bottom end bearings which are also surprisingly worn..and maybe a water pump if i cant rebuild this one..