The only mod that I noticed that helped was the deflector. No other "aftermarket" mods are necessary IMO. In the BS thread you can see a homemade deflector I made, I think I was one of the first, so there are probably some better ones out there. But the only reason was the the middle of my pizzas were getting scorched. The other thing which really isn't a mod, is just messing with the height of your stone. That plays a big role in the bottom/top heat balance.
To go for neo you definitely need to crank up the head. You said 700, do you have an IR thermometer? You need to get under 90 seconds to find that neo sweet spot where the dough just melts in your mouth.
I would start recording everything you do, just so when you do find the best one, you can remember how to replicate.