Why hail driver? Ricochets tend to break the freeze (I witnessed this happening at least 3/5 times) unless you aim where you don't make the bullet ricochet back into the enemy. Furthermore, you have Polaris (even better for soloing IMO) and AP is just... already an awesome elemental gun. As far as alchemers go, get voltech if you don't have a polaris line if you want the shock and elemental, magma can be neglected for nova driver, umbra can't be compared since it's the lone alchemer that does a totally different damage, and hail... unless you plan on shooting directly in front of enemies instead of the usual to-the-right so the bullet ricochets back into the enemy, you are better off getting a shivermist or glacius for freeze.
Sentenza might make a good alternative to Umbra now that it does full shadow, but umbra still has the advantage of being able to out DPS it. Magma can be ditched for nova. Storm... you already own polaris. Hail... well I won't comment further since I'm not exactly a fan of it.
As a little side note, Magma may or may not be worth getting as well if you plan on melting Ice jellies.
They are good guns, if you lack an elemental dps gun. But since you already have an ap, it might not be as useful.
As far as statuses go on alchemers, the damage from the status will, most of the time, not make up for the damage difference compared to nova.