When you put them in bigger pots, I would mix some coarser grittier stuff in with the miracle grow cactus stuff. This will help the pots drain/dry out faster. I use pumice, but that is not always easy to acquire (most big box stores do not carry it), though in some places something called Dry Stall (or Stall Dry - I think there are competing products with flipped around names out there, only one is pumice, the other is not), which people use in horse stalls, is made of pumice.
Other people use lava rock, perlite, or sometimes just some coarse gravel.
On the other hand things seem to be going really well so maybe you do not really need to change too much - though as these plants grow they can get a little more demanding about winter dry periods. I essentially pretty much stop watering them in late October/early November once night time lows go consistently below 50F.
However, if you want to test to see if the leaves will 'open' up a little more if the plant is in more shade you can do the shade cloth test. I am pretty sure that is what it is. I have one plant on the patio seeing only late afternoon sun and that one has a much more open posture leaf wise.
