You really shouldn't need one. The only time I would add one is if I have a prized plane with super-high wing loading that could never make it back. Is your low-end set optimally? I see rich low ends constantly on training nights (often with lean high ends). What about the glow plug? If you are loosing so many RPM's after the igniter is removed then you may be looking at a plug that isn't reacting with the methanol properly.