Rune improvements to make my DB10 more reliable?

Hi,

currently running this DB10 team with Hwa until I eventually fuse Sig to speed it up. It's about 90% success, 1 failure every refill or so. Generally occurs when Spectra doesn't debuff immunity crystal twice or Bella misses seize multiple times in a row.

Just wondering what stats I need to improve on to make it more reliable (speed is whatever, 3:20-3:40 average I'd say)

Verdehile (L): Violent/Blade: 25800 HP, 650 DEF, 142 SPD, 99% CR [Going to bring him up to ~160 SPD]

Veromos: Violent/Energy: 22600 HP, 1000 DEF, 181 SPD, 56% ACC

Belladeon: Violent/Energy: 22800 HP, 930 DEF, 187 SPD, 55% ACC

Spectra: Swift/Energy: 24000 HP, 800 DEF, 227 SPD, 37% CR, 40% ACC [Going to raise ACC% to 55%, and put a CritR rune on 4 with HP subs]

Hwa: Violent/Blade: 22200 HP, 1270ATK, 1000 DEF, 162 SPD, 98% CR, 55% ACC