My two pence.
I've had an IMDN prem and Godzilla Pro at the same time and that worked okay. I've played a fair bit of JP2 prem and a fair bit of Jaws on location.
All of Elwins games that I've played are good. IMDN and JP2 are the most linear game goal wise. Which means you learn how to progress through the game to eventually complete the goal (there are ways to score big points but the goal is central) . GZ, AIQ and Jaws are positioned the other way round. Less linear, more point scoring tactics but do have a completion goal, if you want to play that way.
I would consider having a reasonably diverse collection in terms of gameplay.
Currently, I have 3 main games that are very different in that respect.
WOZ - it's a journey.
TNA - a brutal test of skills and reactions.
BSD - goal orientated to getting all 3 multi balls going to score big points.
You should set your wide body up steep to speed it up a bit.