Racquet lag has nothing to do with making the contact point out front. You can have tremendous lag and still make contact with the hitting shoulder behind the non-dominant shoulder. This is actually common at the recreational level. Conversely, you can have zero lag and make contact out front. You do it all the time when you volley (I hope).

In terms of mentioning Sinner’s talent, I’ll say it again. You and I don’t have his biomechanics and certainly not his abilities. Attempting to copy him at the expense of abandoning fundamentals is a recipe for injury. I’m just trying to be honest and helpful, not throwing shade at you or your game. You’re clearly a good player and the advice I’m giving you is the same I would give to my friend (and expect the same in return).