The Grand Mayan is the same points requirements if you book via HGVC. 3400/4800.
The Grand Luxxe costs Kingsland Phase 1 points.
Ah, right you are. Although after a week on the Grand Mayan mattresses, I haven't stayed at one since. Grand Bliss or higher, baby. LOL! If you like a REALLY firm mattress, then GM is for you. haha.
If you're wanting anything "higher" I'd suggest depositing your week with SFX (Hilton 3400 point or 2400 point Las Vegas week) and getting the Grand Bliss (only in Riviera Maya/Nuevo Vallarta) or Grand Luxxe. GL is a $300 upcharge, but worth it, IMO.
Unfortunately had to pass up the newest Grand Luxxe offering in Nuevo this year. Going to Key West in July, then Orlando in October and Hawaii in Feb, so kinda blew the budget.