To be honest there hasnt been much laughing in that bathroom the last couple of days...let alone any 'Elvis Willy'. 🙁
If put down a few more screws and it seems a bit better. I would consider ripping it up and starting again but from what ive read NMP + NMP megastrength adhesive is not something that is going to come apart from the underlying floorboards...
Go to screwfix get some 20mm turbo gold screws fix them every 300mm using an impact driver and see what it's like....should get rid of some of that bounce.