So I'll just chime in here a bit. I'm a pretty good player, but definitely not near the best in the DFW area. I got my GB Premium almost a week ago and we have been playing the heck out of it (over 100 games I'm sure). No center post, no elongated rails etc. I do have an Art airball protector and glad because airballs are bad when they are constant (to much risk for damage).
I did pound up the outside rails 1/4" and I don't see issues with hop overs. They happen occasionally, but they happen occasionally on every pin I own. I did move the outlane posts in to the narrower slot, but that's it.
I made sure the large rubber rings around the slingshots are below the small rubber rings on the posts. It makes the slings way more active and some of you may hate that, but I LOVE it. Makes the game harder? Probably...
So with that said, I scored 3.8 Billion last night (completed maybe 4 modes). I see no reason to make this game easier to play. It's a total blast as is. You learn to choose your shots to limit your risk. You learn to nudge. You learn to backhand targets, trap the ball with a flipper, etc to keep the ball under control. That is the key to pinball. Control.
My wife loves the game and my son loves it (he's 11). We moan when a bad ball happens, but we understand that is part of the risk and fun of playing pinball, it's random, it's hard, it's a lot of fun when things go well. It's a lot of fun when they don't go so well for who you are playing against (if you all have the right attitude).
However, do you what you want to your game. It's your game! I mod the heck out of my games if I like the mods. I don't add things that fundamentally change how the designer wanted them to play, but that's me.