Interesting thing about the depth difference of the TCE 12" vs 10" cabs: if you are standing close to the front of your vertical 2x12 + 2x10 stack, you can stack the 2x10 toward the back of the 2x12 so the mids/highs reach you at the same time from each cab (more or less). Uffe even demonstrated this in the sales demo vids. Clever marketing "angle", even if it was realized after the cabs were designed.
Acoustic tilt using Combo450 stacked with RS112 - YouTube
@johnsonabq: horizontal interference issues aside, try a 2x12 + 2x10 + 2x10 TCE stack with the RH450 at 2-3 Ohms. The coax tweeters are vertically aligned, the amp is super punchy, and the visual is impressive. Maybe you're not done with your TCE GAS!
Mark