It looks like you’ve already made up your mind, so don’t let anyone tell you otherwise (action too heavy, etc).
This action is NOT heavy! of course, that is, unless, one has been playing on keybed/board made of feathers.
I am not kidding, the P-515 is the best instrument in its class, and I’m coming from an LX-17. Ironically enough, the P-515 was supposed to be a ‘downgrade,’ yet it turned out to be a much cheaper upgrade (if that makes any sense).
This instrument does not cease to amaze me, and for what? a meager $1,500!
Now, when we talk hybrids (NV-5, N1X, etc), yes, that’s another league (category), but it also comes with a hefty price. If I had the money, my choice would be the N1X.