^ First of all, these rules aren't like official rules. You can follow them or not, it's your choice.
Now, most of the staff items aren't OP. The only OP thing that a staff member can have is the GM gun, that only GMs and Admins have. The staff / GM sets are worse than elektra +7 and the GM trans is even worse that lanny. Even the flags aren't really that OP. And most of us use member flags over them because of the speed bonus. But I guess it could be called OP.
"Jura isn't too OP on flop". Wut. Jura has a bigger hitbox that any other trans (maybe not codered) and is as fast as lanny. You can't run from it, you can't dodge it, and you can't block it either. There is no escape from Jura. Most of the people who have it, don't really know how to use it, but trust me, if someone that knows how to use jura plays with it, you can't run from it.
Also, Meto is the best item in the game. It may not have the highest dmg, but it has more bullets than the highest dmg gun, and according to the rules, Justice is banned as well.
You're comparing 2 different things. Meto and membership.
Somebody with membership and items like tier 3 set is way more powerful than a lvl 172. However, he can be pushed, whereas if you use meto is a totally different thing. You don't even have to get close to deal high amount of dmg to the base.