Not familiar with the end mill you're using. I know their insert cutters work really well. I think the feed rates you're getting from Gwizard are a bunch of crap. I don't know where this gou comes up with the feeds and speeds he does. Your feed rate us way too high. When I do a ruff cut, I will run the cutter 5,000 RPM, 40 IPM, .200 depth of cut and about 20% of the cutter diameter width of cut, while leaving .015 for a finish cut, then I'll slow down to 3,500 RPM and about 25 IPM for the finish pass for which I will always take at least one spring pass.
I have never been able to get a satisfactory finish while running the spindle 5,100 RPM.
You can buy GOOD PARTS or you can buy CHEAP PARTS, but you can't buy GOOD CHEAP PARTS.