I'm considering substituting a Fundamentally Weighted Index (Investopedia: Terms F Fundamentally...) for the RSP portion, perhaps something like QUAL (https://www.etf.com/QUAL). If so, I'd need to settle upon a sensible distribution between QQQE and QUAL? Any thoughts?

I wouldn't go for QUAL, myself.
Like most equity ETFs it is capitalization weighted. A bad thing.

It's only a little bit more typing to do this : )
mungofitch replies on Dividends
It's pretty likely the stocks would be somewhat richly valued, as most tings are these days, so the next drawdown might be almost as bad as with SPY.
But at least you'd have some small reason to believe you might be getting an edge over time. Maybe.

There are lots of other ways to skin the cat.
More QQQE?
Move the stuff that you considered to cash, and write cash-backed puts against QQQE or RSP or whatever, at strikes a little closer to fair value?
My experience with repeated cash-backed put writing is getting a return that tends to be half way between [the return on the underlying security in the same time] and [a constant 10%/year]
Though it works better with individual stocks than with funds.

Jim