Anytime you grind on something I agree it looses strength but for the nominal amount needed from what I see on the rockers I would say sure try to adjust your shafts a little but at the end of the day if the rockers are too close grind them if needed. I have seen it done over the years to many , many setups and have not seen them fail yet. Again my 2 cents only

6.50 @105.26