hi, sorry for answering late
I kinda misled with the recolored sprite in the thumbnail, didn't I?
but yeah, creating a new tier of flamethrower ammo was not the goal, just making basic ammo available on Gleba.
I also thought that in Factorio there are very few cases of tiered things, like there are bullet mags and shotgun shells, but that's it. Like if you want bigger damage, you achieve it with tech research or quality.
But actually, since there is stuff like "piercing shotgun shells" or uranium ammo already, why not have special upgraded Gleba flamer ammo?
I'll think about it, but imho it should be doing something more interesting than just "+50% damage", maybe slowdown or faster projectile speed