Self Cast Flameblast - Feedback on my League Starter Build

Hi friends!

I really want to make flameblast work without totems. If someone can give me some feedback on my PoB I made, that'd be great. I'll value and appreciate any feedback.

PoB - https://pastebin.com/vp0Yr4dT

The thought process was as follows

Problem - Flameblast needs a lot of cast speed and mana so I can maybe make it feel good

Solution - Use Instruments of Zeal to get mana regen plus 75% cast speed.

Problem - Gaining Fanatacism without too much pain.

Solution - Frenzy as my attack, spellsplinger to toss some fireballs to not make the attack feel useless

Problem - Flameblast and getting stunned sounds quite sad.

Solution - Navigate down to unwavering stance while grabbing extra armour and life nodes.