Huh ... funny ehh...my no 3 is also the lowest. I had fist 1=143, 2=145, 3=135, 4=143, 5=147 6=150. Took head off and done head rebuild, fund cyl 3 2 doggy valve seats, replaced...after that readings by UAS. 1=125, 2=130, 3=120, 4=115, 5=130, 6=125. Makes to you any sense? Car runs great... F**K the readings..hehehehe.
Cheers,
EUG.