Glad to hear you got it running decent.
In my experience, these are hot running motors, I only run my OH160 at WOT when cuttin ggrass, other than that it's usually only 1/2-3/4 throttle. It looks like you hav all the tins in place which actually helps move air over the motor to help cool.
I try to run mine as rich as it can put up with, helps run slightly cooler.
I think factory spec is 3500 rpm, but I have no meter to check or tach so mine is all factory setting regarding upper limits.
As I stated earlier, mine is very touchy so I have to set it to where it's not missing, 1/8 turn on the wrong screw and she starts running bad so it's pretty easy for me to tune, it has a very small sweet spot to run well.