I have never tried OLCI at this property. My two upgrades beyond retreat villas were last minute surprises (they did show online late morning on the day of arrival though); I was explicitly told that they were for repeat guests.

I think 301 will be a great starting point, and worth locking in.
The 2 bedroom units are perfect for families and friends, but IMHO too spread out (over 2 levels) for a couple not tired of seeing each other.
The royal villa seems best used as a social center in conjunction with friends/family staying in the adjacent normal villa (IIRC there is an usually locked private gate between them), as its main asset, besides the XL swimming pool and privacy, are large living/dining rooms with a staff kitchen/entrance. Its views are not the best, as the rocks in front of it make the nearby waters appear less blue.