Is this a good farming class set? Any information or insights is welcome.
Linker fits pretty well with Pyro and Sorc. Did you think about that?
My bad, i forgot to put linker, but it is there now. Sorry! 
Can’t say anything about Sorc and Alch, however Linker and Pyro2 are really nice for leveling/farming.
Linker should also be really nice for Sorcs summons, spreading damage to multiple enemies is always nice.
I tried Pyro 2 Link Sorc in icbt2 only. In my opinion, it may be suitable for your farming purpose, even though I don’t quite enjoy seeing my sp being drained so fast =/
I would go Pyro > Linker 2 > Sorc actualy, Pyro has some damage to help your summon even at circle one.
The point is for both parties and solo playing Linker 2 will be better, you Summon will probably do more damage than your fire spells even at Pyro 2, so making better Links will do you better, while also being MUCH better for grinding parties whenever you need one.