I love my Pizazz, without question the most plane for the buck on the market!
I'm running a Saito .91 (w/longer gear off of a Hots .60), and standard BB servo's all the way around. HS-605's?
We initially built it to act as a trainer for the more complex set-ups we run on our big acro machines. I.e. flaperon/spoileron mixing... We ended up putting double the flight time on it than we did on any other machine.
If it won't torque roll for you with a .91, change the prop. Frequently with high power loadings the engine is at too low an RPM during hover to generate rotational torque. Change to a Zinger and the (less efficient) prop will allow the engine to rev-up a little higher during the hover. Mine T/R's like a top. I've even done a few tail touches with it. The key to good torque rolls with any airplane is coordinating the throttle whne it starts to fall out. If you can hear the prop cavitating (ripping sound) the plane is falling backwards, increase throttle to straighten out then back off the power again.
There is a lot of rudder coupling but come on! It's a fun fly machine! So does the Su-Do-Khoi, Top Cap and Big Boy! If you wanted to be bored to death by something that tracks like an arrow buy a HYDEOUT!
Harriers are a little more difficult because of the short wingspan on the Pizazz. There is very little roll dampening effect with low aspect ratio wings with servo's in them. You can Harrier and Elevator it but you really have to juggle the controls. Try to find the "sweet spot", about 30 deg. nose high and fly the elevator, don't hold it full up. Try spoileron mix, and finally try it in the last 4 minutes of your flight after you've burned off that 1st half pound of fuel. The snap/tipstall characteristics soften as the weight goes down.
Don't ever add lead to an airplane, it's like driving with the parking brake on! Move the battery, motor and servo's to get things right. Especially in the extremities, lead not only adds weight but inertia too. With nose or tail weight the plane becomes more difficult to initiate pitching movements and recover from them. If you need nose weight ditch the motor and get a bigger one!
In addition to getting wild, it'll slow down to a walk for landing. Guys at our club bought out the hobby shop inventory and caused a small backlog of orders for Horizon after flying it. We even bought a second one. It'll be Transparent Purple with Yellow and Black checkerboards (in case anyone's keeping track).
If anyone's dissatisfied with their set up, drop me a line and I'd be happy to offer up some ideas to correct it.

Chris