oil pressure and adjustable hydraulic valve adjustment

Let me understand one thing is the oil pressure numbers you gave are at an idle 12 psi and now it's 55 psi if so 55 psi is way to high. Most oil pressure is checked at 2000 rpms. If you have 55 psi at an idle and the engine hits 5000 rpms and oil pressure increases you could have well over 100 psi that could be close to blowing the oil filter up and you losing all oil pressure. The rule of thumb I us is 10 psi per 1000 rpms that keeps you safe. As far a valve adjustment it doesn't hurt to recheck it just to be sure. I make sure the exhaust valve is open and adjust the intake valve once all the intakes are done do the same with the exhaust valves with the intake valve open yes it takes time but it your engine and if the valves are to tight it will never run right. And one other thing if the engine is staying between 190 and 210 you should be good with that I wouldn't worry until it get to 230 - 240 range then you have an over heating problem. Good Luck