Eric,
Did you get all of your plants above at Hirt's, the ones that aren't growing very well?
I'm sorry to hear that your plants aren't doing well.
I don't know of any pink flowered porterweed that grows 2.5 feet by 2.5 feet. Where did you buy that plant at?
I don't know if agastaches are slow growers. If you have a good viable plant that is putting out roots, then it should be growing good, maybe a little slower than other plants, but growing with top growth and roots. Since your plants are in quart pots, they would be slow growers to fill the pot with roots, than if they were in smaller pots.
Here's some links that David Salman (the founder of High Country Gardens) wrote regarding agastaches. Read them to get better informed on growing agastaches. I thought they would help you with agastaches.
https://www.highcountrygardens...
https://www.highcountrygardens...
https://www.highcountrygardens...
