Made some additional trades. When $NUGT just kept climbing even as Gold was dropping, I capitulated and closed my July 8 $170 call and rolled it into a July 15 $220/$131 Strangle.
I rolled my July 8 $175 calls up to July 8 $190, $195 and $200 calls once $NUGT started to show some weakness.
The reason I sold the covered call yesterday was so that if $NUGT continued to run higher, the profit from that trade would substantially cover any potential losses from the $170 and $175 calls.