Agreed, straight tooth cutters can be a challenge, all the more so if you can't bury them.
The two mills are not directly comparable, but a lot of the principals should carry over. I can't take cuts like that either (at the cutter's max speed) unless I take my advice on how to set up the machine. Unless you ran it too fast I doubt you've hurt the cutter, but if dull, now you need a tool and cutter grinder! They really do make an excellent companion to a horizontal mill as the cutters have lots of life in them and are terribly expensive new. They are just the thing as one sometimes stumbles into lurking piles of cutters for cheap.... but you need a way to sharpen them.