the low chance of the fire spells is a real pain ( I got 4 fizzle in a fight and lost )
anyone know how to overcome it? or how do I get spells that increase the chance?
Depending on your level there maybe gear with accuracy built in or use Infallible, TC or trained spell helps.
Fizzle rate has been a problem on all my wizards for quite some time now, no matter what school and some it's not as handy to build in some accuracy to counter it. Our death has pretty much taken to fizzling on the first damage spell cast in every fight. My Ice can fizzle easily twice in a battle. Where as our storms have more built into gear but still are having a hit and miss with it. This has become my second "pet" peeve in the game now and can be very annoying.
I understand your frustration with your rate of fizzle as I'm currently assisting a family member with a Fire school wizard with leveling. My suggestion to you is as you acquire new gear, be mindful if the gear has Accuracy on it and this will raise your base accuracy, which will lower your fizzle rate.
As you level the gear you acquire will offer higher stats and/or additional ones to improve many aspects of your wizard. When I acquire new gear for my family member's Fire wizard I focus on Accuracy, then Damage, and lastly resistance, but if the gear has no accuracy, then if it was dropped I sell it. At the bazaar, I use the same strategy for purchasing new gear.
The Fire wizard I play part-time has the same 75% base accuracy as you, but her gear gives an additional 15% accuracy, so I don't fizzle as often.
I hope this helps you, and you eventually will overcome your frequent fizzles with better gear .