Pseudomonas is MUCH more active in spring. I'm not positive this is pseudomonas. Give it as much sun as you can without shocking it and I would continue to feed it like you have been. (That's to say, don't feed it heavily now if you haven't already been.) I wouldn't prune anything, and I'd wire/position tips upward in the hopes that it would grow strongly. Don't get that black spot wet. I'd strongly consider a systemic fungicide, but I'd definitely treat it w/ a diluted peroxide spray on the black spot.