I have noticed that the following macro will no longer fire off lava burst at all, even when spammed.

/cast lightning bolt
/cast lava burst

I did get the next one to work, but for some reason there is a significant pause between each lightning bolt cast

/castsequence lightning bolt
/cast lava burst

And I have tried messing around with the custom lag tolerance bar thingy, get a pause between casts no matter what i have t set at, any ideas?