Good advice for a tuning technique.

Glowplugs burn out when the needle is too lean. It's also very touchy to set the needle properly when the chosen prop is too small for the engine. It was good advice to try a larger one. A 10-6 is an excellent prop for a .35, but is a bit on the small side for a .46. All my 46s run best with 11" or 12" props on them. And none eat glowplugs. What happens is the too small prop unloads way more than a proper sized one.

Actually, if you keep using the tach it will be a good and useful tool. It just takes some experience, enough to realize that a lot of advice isn't really good advice.