Not sure if Tom explained weight forward this way so forgive me if this is redundant. Just watched a SnT video that explained it a bit different that what I've seen or can recall. We've all read and viewed info about the emphasis on weight forward. But what is the weight? Where does the weight come from? It's NOT the weight of the chest and shoulders on the lead side. It's hips forward. I know Tom puts emphasis on keeping the head and shoulders center so that is the same concept. If you put the weight of the shoulders and head onto your lead side you'd be too steep and chopping.
Sorry if I'm stating the obvious. I felt it was just a different way of conveying the 'weight forward' message.
This gets more important as the length of the club increases. The last couple weeks I've been working on driver. I super concentrated on keeping my head and shoulders still and gliding my hips forward. Huge improvement on decreasing backspin which improves aerodynamics of the ball flight and decreases the 'ballooning' effect.
@Gerry_Lager I personally do not think you need to focus on "weight forward" in SnT. That, IMO, is taught to get you on your left side because you (and millions of others) have a tendency to hang out on the right side on the downswing, or shift too far to the trail side on the backswing.
In reality, if you stay stacked over the ball to the top, and you have not flattened your shoulders on the way to the top, your weight will be where it needs to be. The other piece is this.....from the top, the lower body travels laterally about 3 or so inches, then the lead leg posts-up. The lateral shift, and subsequent post up move, occurs VERY quickly, so you should practice both separately, then together with very short swings.
Too much of anything in the golf swing is not a good thing, so pre-loading weight on the lead side, say more than 55/45, can create more issues. I posted a new comment under "Lower Body - Final Frontier" which I think might help you. I personally would not go to 90/10 because if you need to put that much weight on your lead side, then there's something else going on that is causing a significant imbalance. At that point I suggest doing a Video lesson with Tom.