Wish I could help you Jerry but I can't. Looking forward to what others have to say.
I talked to the good folks at Infinity this morning and was given the following advise but have not tried what they told me to do yet. I did tell them that if I cannot get their bit to work for me that I am going to buy a Whiteside bit and try it and if the Whiteside works and their bit does not after doing what they teill me that it sure is going to be posted on the forum. But and this is important, I sure cannot make any judgement until I do what they have told me to try. Here are the things that they have suggestied.
Turn the speed of the router down to turns as slow as it will go.
Try to remove as much of the material as I can with a straight bit before attempting
to make the cut.
Soak the board whey the cut is going to made in Mineral Spirits to soften the wood
Attach the workpiece to a thick piece of material with double sided tape to help keep the board square with the router table top.
Remember, we are talking about end grain cut with the workpiece being vertical and pressed against the fence, not flat on the table. I am not having problems with the cut made with the workpiece flat on the table.
I'll keep you posted on my results, right now I'm tied up making a set of jigs for the cutting of the recesses for small hinges for small boxes. I had the jig perfected but as it so many time goes, as you work on an idea, you keep seeing ways to make it better. In this case, having two jigs instead of just one will all the cuts to made with only one set up and then having to do second set up for the second hinge will not be needed. That's where the rub came in for me with having just a single jig instead of two of them. I'm right in the middle of making the set right now.