Having been in this country half of my time from 2013 to 2019 and continuously since late 2019, I have been all over the country, extensively and I live in Cebu, speak Visayan and Spanish and I'm American. I'm careful not to knock anyone's town online because it hurts business.
If you go anywhere, you probably won't regret it, because you won't know what you missed. Whatever you do, you're landing at 1pm and you're probably not diving the first day unless it's a sunset dive. Even then you'd have to hustle. So get where you're going and leave your gear at the diveshop you're going to dive at. Then go eat.
Your choices, as you know are where to go from Manila. I don't suggest the busses and ferries for 8 hours after arriving in the country. I drive here everyday. You're lucky if it's 8 hours.
Get on a very short and cheap flight and go to Coron. Commute for half an hour after landing there. You already have nitrox and AOW, the cost is close enough to the same and you can dive on most parts of most of the spectacular wrecks. Go to Helldivers to dive, stay whereever it's cheap nearby. Eat streetfood. Thank me later.
That's plan A, dude, honestly.
Plan B: get on a very cheap short flight from Manila to Tagbilaran and stay anywhere cheap in Alona Beach within walking distance to either Alona Divers or Valm. Go to Balicasag your first morning and be blown away by absolutely world class stunning beautiful aquatic habitat. The diving there is easy. On your ticketing websites, it is listed as TAG, but you'd be flying right into Panglao, the new international airport.