I didn't read (or at least I missed the reply) where anyone says a thing about C.G. I've flown that Edge (The difference is that I'm flying over 8000ft.) on a 2 stroke 1.80. I find it's nose heavy with CG balance as said in the construction manual. Spread weight all over the fuselage so u don't have to add any more weight to the tail. Remember an easily hoverable plane should be a bit tail heavy(and the lighter, the better). Actually u should be able to fly a stable knife-edge flight using nothing more than 1/3 throttle.
Don't move sticks like mad.... gentle stick movements will deliver a better hover performance. (it works pretty good for me).
When an experienced flyer is hovering a plane, doesn't "rock" throttle much more than 3 - 4 clicks up or down. When doing a Torque Roll they rock the throttle because it makes the plane to roll faster, not because they're still finding the right rpm's to mantain the hover.
About the wing drop... I'd put an extra right trust degree on that engine. I found my 1st hoverable plane ( a Christophe Paysant's Madness) had zero right thrust marked in the plans and when finished it, I was unable to hover the damn thing. Actually it made the best-fastest left hammerheads I've ever seen every time I released a bit the full-right rudder. Of course it was corrected adding 1 1/2° right thurst.

Forgive mispellings. This is not my 1st language.

Greetings every1