From using a MFLB and a VaporGenie i can tell you draw speed is very important try drawing slowly...See this is why I'm asking lol but no it's not too hot to make me remove my hand but it's hot. But yet it's still the best results I've had
I had the vg and had only "okay" results for awhile and then got a mflb. using the mflb made me learn about the importance of draw speed.... going back to the VG and using what i learned made a huge difference.
edit: its probably best to practice draw speed with out a water pipe... then you can feel the difference of heat and how it corresponds to your draw speed.