Mostly you lost because you couldn't contain Soler. He controlled the flow of the game on both sides of the ball for the entire first half. Sadly, not much you can do against a guy with 1mil DMI. You did have a depth advantage but slowing the game down with LP and a zone didn't push his starters at all.
When you're trying to avoid a PG like Soler or your team has lower flow, speed up the game, play Man and a higher paced offense, move your best OD/H defender to guard him.
The 5 fouls on your SF Large was a problem. He's always aggressive anyway. Sometimes low Experience or Handling skills much lower than his opponent is the problem. Sometimes low ID if they have high Driving skills. Is his OD above Mediocre? I'd start with him if you're looking to upgrade a guy before the finals. Maybe get lucky and find a pure defender with 8-12 on both defenses, 8 handling, 8 passing, 8 rebounding. doesn't matter what his shooting is as long as you can afford it.
Effort should have been close for both teams so thats probably not the reason. Road games just suck.