Thanks again for the advice Stuart. The left side breathing problem is indeed subtle, but from "following the shoulder" during practice the last 2 days I think I perceive it to be more smooth and fluid. I'll have to get someone to look at it to confirm.
Not sure about any of the big 3 yet. As per my first post in this thread, the goal is to go sub-20 minutes for a 1500m.
If all goes to plan I'll swim 10km and 15km races early next year and then Lake Zurich in July.