evilunclegrimace
Does not always play well with others
Just a thought - If you have a high volume oil pump on your engine do you also have a larger oil pan? I know of a friend who put a high volume oil pump on and then had issues similar to what you describe only to find that the oil pump was running out of oil and cavitating. He solved the problem by installing a bigger oil pan.
The Melling 55A oil pump is a high pressure standard volume pump. It is a stock replacement item.