Note: Ignition Break doesn't have cast delay; it has cooldown, so the 20% cast delay reduction from +9 TGL won't have an impact. Violet Fear is slightly better for damage, but seeing as how you already have +9 TGL, stick with that.
Fire element: Ignition Break does more damage when you are endowed with fire element, although Ignition Break deals neutral damage. If you don't want to use elemental scrolls or don't have access to a Sage/Scholar/Sorcerer to endow you with fire, you can use a RTE. You can card it with 3x Hunter Fly cards for HP restoration. Elemental scrolls are cheap, though, so you should use them if you're sticking with TGL.
Animation delay: The animation delay for IB and BB can be reduced by higher ASPD (usually higher AGI, so you should be fine with 50 AGI).
Combos: Bowling Bash, Ignition Break, and, eventually, Storm Blast (requires a rune). You can also use Wind Cutter in place of Storm Blast, but only after you get IB to level 5. A Sword Guardian-carded weapon is useful for the BB part of the combo.
Stats: As you level, work on increasing your VIT and DEX. I'd get to 80 DEX first, then 90 VIT, but you can prioritize VIT first if you need more HP/Def for survival early on.
Unfortunately, you're already at level 100, but if you were still level 99, I would've recommended doing the 91-99 Eden Group quests, using a BMX3 when you turn them in (along with Bounty Boards and Gramps TI), then die until you're back to 0% base EXP at level 99. Repeat until your job level is high enough.
