Monte - use your dremel or a fine/medium file and deepen the recess in your receiver. I do this on every Savage/Stevens receiver.
As far as holding the lug to prevent cant, that is tough. The tool you provided a link to would work though. Believe the differences in the lugs vary - some, as you described, is the angle of the sides of the lug. So, different tool for different brand of lug.
The lugs Northlander sells work rather well.
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