Some on this forum may beg to differ,
LOL he's probably referring mainly to me! ![]()
I should confess that I've done very little study of philosophy in general, let alone Epicurean philosophy.
I think the deeper you read into the philosophy the more you'll feel that this formulation (maybe or maybe not by Philodemus) is dramatically inadequate as a full statement of the philosophy, just as you find a statement like "pleasure is the greatest good" to be inadequate.
On the other hand, both the tetrapharmakon and the "greatest good" formulation are very useful as starting points for discussion and focusing on the issues involved, so they do have their uses even in my own perspective. They are partial statements useful in some contexts, and only by discussing the limitations and the contexts do you grow in understanding of when they are useful and when they are not and what else may be needed.
It's probably not lost on you that the rules of the forum are that we are here to promote Epicurean philosophy and not eclectic blends. At some point if you do decide to promote something that's your own blend then it becomes inappropriate to promote it here, and you'll want your own website and your own forum. However the purpose of this forum is for discussion and study of the issues of Epicurean philosophy, and all of us were at one point or another just grappling with these same issues. So it is totally appropriate for you to raise issues and discuss possibilities and generally proceed with as deep a good-faith discussion as you like, so I hope you will.
Raise each of the points you want to discuss in detail, and I think you'll find me and a number of other people are happy to respond and help you think through the issues, and in doing so that helps us all.