I bought several here from V1. 1/8″ 2 Flute Carbide Long bit burned very quickly.
I’m still learning so this will not be my last burnt bit! I only cut 1 Low rider part then on the second one it started to burn, then messed up the cut by running of track.
Material and spindle? Speeds in foam vs aluminum are completely different and also vary by spindle RPM. A 12" machine can cut faster than a 3’ machine. The z axis length has a similar effect.
Your feed rates seem slow. I use half of the bit diameter as a depth and played with feed speeds to find what I like. 1/32 is running at 10mm/s in baltic birch without problem, 1/8 endmill is moving 18-20 mm/s without problem. I cant slow down my spindle so i speed up the feed.
After rereading it I understand what you are saying. I try to stay under 20mm/s when milling. I will hopefully try some tests soon but instead of faster I just cut deeper. I feel that will give the best accuracy while not sacrificing job time.