I'm having the same problem with my 2010 11m Waroo; I'm 92kg.
Bit of background on my not extensive relaunching experience;
The school DNAs are beautiful for relaunch, they sit on their edge & relaunch like a dream.
The 2010 Switchblades (8 & 10m) I used in QLD were easy to relaunch as well, bit of a tug on the correct rear line & up they went.
The Waroo is new for me, so I understand there's a dialling in time required & I concede it's probably something I'm not doing right, but damn it's getting frustrating.

The last couple of times I've been out I just have not been able to relaunch the kite; it goes down and just doesn't want to get up.
It certainly doesn't automatically roll over on its edge, I pull on the appropriate rear line and it's like a tug of war.
I have gotten it onto its edge eventually, but like lortap says, it just doesn't seem to have enough power to lift off (sheeting in , sheeting out doesn't seem to make any difference); then it decides to roll over, sometimes on its leading edge, sometimes on its trailing edge, it also likes to do the half twist.
Pulling the front lines doesn't get it going, pulling the rear lines doesn't get it going; I believe I'm doing these things at the appropriate times.
I couldn't really swim towards the kite or around it, as it was still pulling me like a truck even though it was downed.
A bit of info on the trim state;
The kite sits nicely at 12, very stable and the bar is at a comfortable position when riding (for the short time I do anyway) and body dragging.
I pump the bladders up until I can't pump anymore- no leaks in the bladders either.
I really need to know what I'm doing wrong.
This problem is really cutting into my time on the water; just as I'm getting to hold a good edge & learning how to control the power of the kite- crash & game over for that arvo.
Last time it happened was yesterday arvo at Pinnaroo, I think it was blowing around 20+knots.
Advice would be greatly appreciated from anyone who flies this kite, any Best team riders or Best kite sellers.
Thanks in advance.