Hi Patrick
I have practiced Swimming Dragon, matter of fact its the only other form of Qigong I've tried other than SFQ. I was doing Swimming Dragon and Spring Forest Qigong on opposite days.
I was receiving more benefit from SFQ so eventually I just starting sticking to SFQ.
Same thing with meditation.
I believe the "rule" is to not mix them. But to practice them at different times. It is probably best to stick with one or the other. This way your energy system gets used to one form.
JEFF