high water pressure after bleeding boiler

Familar knocking and tinkling occurring in my 1st and 2nd floor baseboards so went to purge the air yesterday. It was not a cold day here yesterday so I shutdown the system for a few hours before purging. Saw a ton of air come out from my 2nd floor zone and went thru about 15 gallons of water, the 1st floor had very little air (the tinkler). When purging I was throttling the auto fill to try and maintain water level but I did notice the water pressure dropped down to about 5. When complete, I manually opened the auto fill valve until cold pressure got to about 13 and then I heard the auto fill kick in and it seemed to stop around 15. When I turned the heat back on I noticed water pressure creeping up to 20, and then 25, and then 30, at which time I shut off the system worried that I was close to the relief valve spewing water. After a while, I took some water out of the bottom spigot of the boiler,,,probably a few gallons to get the hot pressure back to 15. After an over-night, its sitting hot at around 22. My settings are 180high and 140low. The expansion tank sounds hollow to tap and underneath the see-thru bubble is clear. This is a 30+ year old NY Boiler system, located in my basement (zone 1), with baseboard in 1st floor (zone 2) and 2nd floor (zone 3) with a pretty good run of piping to get to all those zones. Not shown in pic but each zone has a bypass valve. About 10 years ago, the 2nd floor added two more rooms and the piping there was extended about another 30' with no changes to the boiler system. A few years ago, I had a freeze event at the farthest run, so presumably there was a an air-block, and the pipe at that turn leaked. There are no air vents on any of the baseboards but its what I'm looking to get installed. But my question is, do I need to do anything else to deal with this borderline high water pressure?