oil systems seem to cause a lot of confusion and they're not very complicated. i used to be of the "MORE OIL" mindset when in reality the smallest pump that will develop the desired pressure is the right pump.

personally i NEVER just take a pump out of the box and install it. you need to disassemble the pump, inspect, deburr and clean it paying close attention to the relief valve. these are a low tolerance fit and any small piece of debris can cause them to stick.

i wouldn't think any pumps are delivered from the manufacture with a discharge pressure higher than 80# especially the more common pumps. if you have a pump that's making over 100# either the relief valve is hanging or there's some issue with the relief spring.