Well, I was playing around and discovered a solution that has been working for me. I have a bottle of TBK Trading's Glamour Polish Base (the one for glitter) and filled an empty bottle until it was about 60% full and filled the remainder with my own topcoat mixture. Wow. It works wonderfully. It's on the thick side but applies evenly and it also smooths, fills and levels the glitter. I apply a quick dry topcoat over that and it is like glass. The best part - that glassy look lasts until I take it off. I have named it GlitterAde - get it? A play on words - glitter + Gatorade = GlitterAde the Glitter Thirst Quencher. Ha!
I wanted to show photos but it's hard to show shine versus no-shine but I tried. I used OPI Designer Series Temptation because it is a huge, huge topcoat eater no matter what I did. Brat.
With Glamour Base 24 hours and many hand washings later. I didn't apply quick dry topcoat for this because I wanted to test the dry time and wear. Dry time was about 10/15 minutes and it wore really well. It works even better with a quick dry over it. I'm still playing and tweaking but so far so good.
If you happen to have a bottle of the Glamour Base try it over a thirsty glitter. It may work for you.