Balance Between Water Retention and Drainage for Container Mix
It seems like the problem with peat-based potting mixes if they have too much peat is that they not only compact but retain too much water if it rains alot, like it can where I live in the early fall. However, if you don't get a lot of rain and it is very hot, like it can be where I live in the spring, the peat helps to keep the moisture level more consistent.
I can't get the true nursery mixes that have more composted conifer bark in them and the orchid bark I can get looks too chunky/uncomposted to me. I have read that composted pine bark fines are sometimes labeled as soil amendments, but I haven't seen them in the big box stores and nurseries around me.
What I have available to me are the retail mixes like Miracle Gro, Fafard (not the nursery mixes) and Jungle Growth. I am concerned that if I try to amend these retail mixes I will make them worse. I take it that most are anti-Miracle Gro so I am deciding between Fafard Professional Mix and Jungle Growth Grower's Mix and Jungle Growth Flower and Vegetable Mix. Are any of these better than the others for growing container tomatoes?