Improving consistency of my UR Mirari/Insult deck

Basically, the idea is to churn through the deck, and either burn down the enemy as quickly as possible, or use the combination of twincast/primal amulet/miraris3 + insult, which quadruples damage, so a single shock does 16, and a wizards lightning/lightning strike does 24 damage. Bloodwater Entity can be used to race enemies and of course get our spells back.

obvious improvements are, of course, upgrading the dual lands, having more insult/injury copies, and probably cutting the Ghitu Flamerunner for 2 more barals. I also think I should cut primal amulet and possibly twincast (maybe keeping a 1 off in slow matchups, if I can't find miraris or it gets dealt with, etc.), and I definitely need search for azcantas. Any other suggestions would be great! I'd love to have a slot for disallow, but I'm not too sure about running more counterspells. Supreme Will is great because its never a dead draw.

The main problem that I have right now is that it feels that it takes too long to come online, outside of really great draws. It needs a minimum of 5 mana to do the mirari shenanigans and without any mana ramp in u/r often that isn't fast enough, or the hands don't seem to have the right answers.

Decklist:

3 Shock (AER) 98

10 Mountain (RIX) 195

4 Lightning Strike (XLN) 149

1 Fight with Fire (DAR) 119

4 Wizard's Lightning (DAR) 152

7 Island (RIX) 193

3 Chart a Course (XLN) 48

3 Cathartic Reunion (KLD) 109

4 The Mirari Conjecture (DAR) 57

4 Highland Lake (RIX) 189

3 Bloodwater Entity (HOU) 138

1 Primal Amulet (XLN) 243

3 Ghitu Lavarunner (DAR) 127

1 Insult /// Injury (AKH) 213

3 Evolving Wilds (AKH) 242

2 Baral, Chief of Compliance (AER) 28

1 Doublecast (M19) 137

3 Supreme Will (HOU) 49

SB:

3 Blink of an Eye (DAR) 46

1 Hour of Devastation (HOU) 97

3 Fiery Cannonade (XLN) 143

4 Abrade (HOU) 83

4 Disallow (AER) 31