So I brewed some light DME in 3 1/2 cups water, which dissolved without issue. I added 1/2 oz leaf hops to the wort and let it boil for 15 min or so. After cooling to 65F, I very carefully added it the the primary, re-sanitized the airlock and walked away. The airlock activity before I did this was slowwwwww...to the point that I was concerned that fermentation was slowing before it had ever really begun. After the DME mix was added, fermentation took off as you would expect. I'll let you know how this turns out in a few weeks. Thanks for the advice!!