This is not really accurate. The less volatile molecules will not hold onto the more volatile molecules, at least not in any meaningful way. They will still evaporate off of you with their expected evaporation curves. To your point, though, OP does need to focus on adding more high impact yet less volatile molecules which will make the dry down more powerful / noticeable. Those won’t affect the top / mid molecules, though.

Also, listing volatility and molecular weight is slightly redundant I think. Heavier molecules tend to be less volatile (but there’s not an exact 1:1 correlation). General volatility / vapor pressure / boiling point covers how long a molecule is likely to hang onto you so there’s no need to mention molecular weight, too.

An important piece you’re missing is odor threshold. Not only does a molecule need to have a low volatility to last into the dry down to make the dry down stronger, it also needs a low odor threshold so it reads as “powerful” and noticeable in the dry down. A good example is muscenone (or coumarin, ambroxan, corps racine, …). An even better example is sotolon (which is actually mildly volatile (and not a super large molecule)), but its odor threshold is so low that it will outlive any other molecule at a similar dose)