Earl is trying anything and everything to try to re-capture some semblance of the game that he had decades ago. I know this because I’m a little older than Earl and I’m experimenting with all sorts of stuff as well for the same reasons.you're a step behind buddy. 15mm tip isn't the latest earl invention - the plateau shoes are. get with it.
The bottom line is that we can’t turn back the clock. Pool is a game (much like golf) that you will peak in your 20s and 30s and can still play strong through your 40s, but by the time you are in your 60s and having played regularly since you were very young, you are in a rapid decline and nothing you can do will stop that.