I would guess that there is something wrong with the end grind of the teeth.
If the teeth are gashed to center with a simple vertical face, they will not cut very freely, so if you cannot improve the angle by regrinding with more rake, then a slightly concave end relief seems to work better, IMO.
If you are using a knee mill, the vertical head could be slightly out of adjustment and causing end of the endmill to drag along, too. It is something to check.
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