Alright. Here's the skinny. I've ordered two all maple satin nitro necks from warmoth just to get the nitro finish (one bass, one guitar), but like you, I wanted gloss. To get it, it's simple. Buy some Virtuoso Cleaner, and any kind of polish you like. I prefer the Ken Smith Wax, or Virtuoso's polish.
1. Apply the cleaner with a nice soft shammy. Buff it out. Do this twice, or three times if you feel you need to.
2. Do the same, with a different shammy, using the polish. You should have a sparkling gloss in no time.
A picture to compare:
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Both the bass, and the two-tone strat are warmoth 'satin nitro' necks after buffing. The butterscotch blonde tele, and the honey blonde strat are gloss nitro necks from the factory (allparts and fender, respectively).
Hope you're able to get that glossiness you're looking for.