ORIGINAL: eddieC

Here's a good thread:

http://www.rcuniverse.com/forum/m_10037915/tm.htm

As already noted, to reduce stall/snap tendency:
1. Reduce weight.
2. Reduce elevator throw.
3. Move CG forward.
4. Limit aileron use on final.
5. Keep speed up on final.

The term 'tip stall' is a misnomer. What's usually experienced is a stall, followed by a roll due to (1) excessive aileron input for recovery, or (2) engine torque. Think about it - why would an aircraft designer make the tip stall first? Wouldn't you want the aileron working right to the last? Right! That's how aircraft are designed - straight wing, single taper, double taper, delta, etc., if properly designed, they are made so the tip (aileron) is working even when the majority of lift is gone. That's why most aircraft have 'washout', an easy way to make the tip keep flying when the rest of the wing is close to a stall.
Airspeed is your friend! Flying the approach with a 'known' throttle setting and keeping the pitch low will keep you out of trouble. Start the landing approach a little fast, and keep reducing power on subsequent landings. You'll start feeling the plane get sluggish, that's when you add a few clicks of power to stay out of trouble.
You shouldn't need to add devices to the wing, you're defeating the purpose. If the airplane's that touchy, you should try another.
The spanwise devices seen on full-scale (a type of vortex generator) aren't meant to 'trip' the airflow over the wing to 'make it stall', but are usually creating turbulence over the horizontal stab or elevator tip to give the pilot a warning 'burble' through the control yoke during slow flight, prior to a stall.

Ed