Yeah... HSS dulls really quick in wood...
I've been using 2 FLute aluminum cutting endmills they have different flute geometry than your generic end mill. And coincidently are identical to the eye to say a Freud up-cut spiral router bit. Except the Freud bit is about $18 and the endmill is about $7 from Enco.
And if you are burning you definitley need to slow your spindle down or increase your feed rate. Heat wrecks the endmills, At 30ipm feed rate I run my router around 13k rpm
and never have a problem with burning in Plywood or MDF. In the plywood check your sawdust that you are creating... Is it dust or little chips? You want to make little chips not dust.
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Nathan |