A YTX14-BS would be stronger. I've used one on my 848 in the past and it cranked well. I have a Shorai LFX18A1 now and it cranks well too.
This says a lot right there. You need a bigger battery but those LED's and USB shouldn't be drawing that much and if they are, it's going to tax your charging system. Might want to think about removing them. The Ducati Superbikes were meant to be raced and ridden fast, not have a lot of extra electrical draws on it.when I disconnect led light kit and USB there's no issues starting