I'd tweak the bodypart split, definitely. And I'd consider holding off on the Strongman stuff for now. 6 erg sessions a week are intense enough, add some lifting on top of that, and you're pretty well set. Unless your conditioning is a specific weakness that you want to address. Otherwise, Strongman, right now, would be a waste of energy and training time.
I'd probably go something like:
Mon.:High Rep, Horizontal push + abs
Tues.:Vertical push + vertical pull
Fri.: Low rep, Horizontal push + abs
Basically, with all the consistent rowing work, I'd want to emphasize horizontal pressing just as much (hence the 2 days, 2 rep ranges). The vertical push/pull day would work towards general shoulder girdle health and stability. Lower body day could use a deadlift variation, some kind of single leg movement (lunge, step-up, pistol, and maybe a big, giant core-intense move, like an overhead squat, or a Turkish Get-up, or something big and complete.
Just some food for thought.