Nice settup, Ryan!
If they are growing fine, then you should expect spikes when those growths are mature.
I am still growing all mine in those tiny clay pots (except for two that I transplanted in a large pot with bark).
Watering is the major challenge for me as well. I mist them everyday, but during the summer, I got a little lazy and they got super dehybrated and some looked very wrinkly.
I soak them at least twice a week for at least half an hour. It seemed to work wonders with them as all the growths are coming back to life and just today as I was soaking them again before my five day trip, I found that three or four of them are growing spikes also! yay!!!
Five day is long enough time for these little guys to dry out. I'm afraid growing spikes might get affected negatively, but the weather says NYC will pretty much be cold and rainy the whole time I am gone, so I am a bit relieved.
By the way, you never got back to me about which tolumnias you wanted. I still have ones without spike which might be easier to ship before the real cold weather kicks in.