You are NOT a idiot , it's just one of the things you pickup when you start using a router table.
Glad you got the fire out and you may want to slow down and let the bit do the work it should not get that hot not with down cut bit or a upcut bit.
Making more than one pass will help,hardwood 1/4" to 3/8" deep 1st pass and then 1/4"to 3/8" again on the 2nd pass should do the trick.
From MLCS woodworking com.
2 flute flat bottom cutters.
Top quality micrograin solid carbide. Will cut faster, smoother and stays sharper longer.
Produces a very clean, fast and accurate cut with minimal chatter.
Upcut spiral helps remove material.
Ideal for making mortise and tenon joints.
Downcut spirals help hold the material in place while using handheld routers.
Will plunge cut and plane edges.
Eliminates chipping at the top of the cut. Ideal for soft & hard woods, plywoods & composites, laminates, plastics and some non-ferrous metals.
Item #5155 will cut grooves for #20 biscuits. Item #7468 can be used with the Leigh Jig. Item #5161 can be used for inlay routing. item #5150/#5170 can be used for shelf pin router jigs. http://www.mlcswoodworking.com/shops.../bt_solid.html