Backspins is a little tricky with the Zeph..she loves more of the roll ups and flat rotational tricks..i can do only 3-5 backspins with my Zeph. on the other side, my SFPro 2.3 is a backspin machine
As for initiating it, giving more slack with the off-hand and even walk downwind help here..also the Zeph needs a little more tug to backspin as a soft one will lat-roll it...the weight will make it harder to backspin from what i tried..
Flapjacks has always been tough for me and even forgot about this till now i read your post lol..
i found it risky for the kites to trick them down so low.but i can do lazies a little bit higher off the ground