I put some hockey tape along the top 1/3 to 1/2 of my lights and it reduced glare significantly. I aim the hotspots to just below the windshield level of on coming sedans and I've never had a single complaint afterwords. I get plenty of throw without producing glare.

I've tried just aiming it down but it would be excessively short throwing to reduce glare to the hockey tape levels. Almost unusable to have to point it down that low.

The hockey tape doesn't actually contact the glass of my NR lights, just the rim.