Your original itinerary will have you getting to/ from different islands much of the day, limiting how much time you can actually explore the islands.,

Now you can see why charter boats are so popular.

I would enjoy Tortola and maybe Virgin Gorda, and do Snorkel trip. Come back again either by boat or visit Anegada/ North sound on a trip. Cane Garden bay area and JVD.

And you WILL be back.