Make sure your fence is parallel to the saw blade.
Use the right saw blade for your wood. The one you show us is not a saw to use for hardwood.
The best is that you use a blade with carbid teeth like Jim showen you. Proxxon got 2 types. 1 got less teeth. That is for thicker cuts.
For all types of wood the speed is almost the same on my saw, just the sawblade makes the difference. The lower speed is for non ferro metals and hard plastics or stone/glass.
Also what pebble mentioned, low feeding speed.
Here is the speed control of the FET
View attachment 386397
This is the the machine micro-mark copied.
If there is a speed control on the new type of Proxxon FET, I don't know. If there isn't it will be not necessary.