Yes, the 219C has a very low forward voltage. You probably want to regulate the high mode unless you’re running 3x nimh or a lifepo4.
Not the cheapest and not from Mtn electronics, but Led4power’s LD-2 driver looks like a great option for the Nichia219C. I just ordered one myself though it hasn’t arrived yet. The high mode has essentially unregulated DD/fet performance but it is limited to 6A by default so you wont blow the led.
Otherwise going with a Q-lite/Nanjg and re-programming it just how you want it as far as the modes go seems like a good option.