Yea seems not necessary to limit the sphere.
Oh, and I have a couple question:
- Is it possible to get more than 1 jackpot effect on 1 devil accesories ,e.g [1] atk, [1] dbl.
- What is usually the desirable effect on acc? like: atk, dbl, trpl ? is hp or def good?
No, because ONLY the bottom slot can have the jackpot.You have plenty of +Atk from your Grid already, so I personally prefer +Def and Affliction.
Offensive wise, having lots of +combo is really good for you though. The problem is, actually finding Accessories with two Double/Triple is extremely rare.
just got a devil accersory for wind with +8%crit rate and it has that 1 infront of it so awesome :P plus it has attack 4% twice so that one is a good one to have