On my server, the bottlenecks seem to be...

Stranglekelp, Sungrass and Netherbloom.
With a few other herbs being rather expensive, but plentiful.

I'm basically doing one toon at a time.
Financing the alchemy with a combination of dailies and gems from the other toons.
I have a list of how many of each herb I need.
And then mail left over herbs, from the last alchemist to the next alchemist.
And track how many of each were mailed.

Then, any that I'm short on, I buy if available, even if the price sucks.
But also check the AH daily for every herb I use, and buy anything that is relatively cheap.
I've got 8 of my desired 30 alchemists, so don't really care that I currently have 401 Felweed and only use 40 per toon; it was cheap so I bought a lot.

I've dropped one of the teams from doing dailies.
So am now averaging around 1.25 to 1.50 circuits of my daily route per day, between two teams.
And am making 900-1000 a day from gems so far.

Kind of a slow pace, as I dropped the dailies as much as possible.

Check the AH as often as you can.
And buy in bulk as much as you can, that is a good price.