oil pressure and adjustable hydraulic valve adjustment

You have a couple issues. First - the "getting hot". 190 isn't hot. If the cooling system can maintain it, regardess of load or weather - you're fine. If it creaps up and you can't bring it down - it's a problem, and can be result from too much friction - aka a bearing problem because the bearings get starved if that cam plug is left out. The lifters don't take much to get them pumped up - but I'd go through and reset the preload. IMO it should be measured if you don't know, then you can duplicate it down the road.