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Pick ya up a few cheap n nasty blades to practice on.
https://uploads.tapatalk-cdn.com/20170304/b53ed960c2482a3dc43a5d7d60b92128.jpg

Mines variable speed also. I go as slow as possible without stopping the wheel.
Settings are at 5 and 6 and always start and stop with the wheel on the blade.
You don't ever want to see sparks,...

Here's a wedge I've been working on with the greaseless, doing the circles mentioned before. This is at the 80 grt. stage, and ready to move up to 120.

Before:...

Here's a pic of the gear.
Gotta thank Sharpton for the greaseless and wheel block.
https://uploads.tapatalk-cdn.com/20170302/ae9bc125db0b80a786acb652b8c1f5dd.jpg

I've done it from greaseless to polish.
Greaseless with felt wheels.
Rag and felt wheels for grease type.
Rag wheels for polishing.
And I've recently found a wheel that's 2 or 2 1/2" in dia. that...

Agreed, final finish is by hand.
But I've found that doing circles the width of the blade with the dremmel instead of back n fourth, eliminates most of the machine marks your talking about.

I do quite often, just take care with rotation of the wheel.
Rotation from spine to edge, and watch your heat.
And for Gods sake wear eye protection.
A lot if guys here frown on the use of the...