Dave
After hearing all the things you have checked , I noticed one thing you didn't. It's a very common problem with the Slow Stik. A very light hit on the front can slightly bend (or badly bend) the aluminum channel. It's not readily noticable if you aren't looking for it , but a very slight bend has a great affect. Sounds like you may have some upthrust due to a bend in the channel.
The aluminum channel really needs some reinforcing. I did this with a piece of 3/8" square balsa. Choose one that's relatively hard. You will have to sand slightly but make sure you get a good tight fit. I put mine as far in as it would go which is almost to the stab. I would imagine a shorter piece would be okay, but why not go all the way.The extra weight won't be enough to affect it but will add a lot of strength.
H>Hi There
model planes -
go vertical -
four broken props.
trying for a bit
costs me $3 to $5 a
sort of urge it
to get it off
sort of cartwheels
although I test
after it takes off.
time landing the
off) of the plane
for me first. So
but as I have got
instructors were there
a stage where I
take off and land
occasion, under the
just made a mistake)