It's hard growing plants right on the border or outside of its zones. I have the same problem with currants not producing much but I guess to get the good you have to take the bad. The heat of summer can really do a number on plants intended for colder climates especially in full sun. I'd say keep it in the shade and it will reward you with a few blooms later down the road. Although they might not be as showy as they would be in full sun it's better than losing the plant. At the same time if space is limited you may want to think about replacing it with a heat tolerant variety like New Millennium which was bred in New Zealand and has reportedly lived through the summer heat of zone 8 in GA. Good luck and I hope this helps.
