You applied Menzerna Power Lock. There isn't anything more you could put on that would make a difference. Most of the ones you mentioned will attract dust like crazy. On top of that you won't see any if little difference at all.
Save your $$.
The "pop" might depend on the color. Darker colors are better I believe. Last time I used it on a darker red, that one coat lasted 8 months.
And the compliments he got were great.
He's willing to pay a hefty price. Half upfront. And it's not a total guarantee I could 100% take it all out. But I'm definitely going to get some of that product you mention. See how that goes.