Like John, I appreciate this discussion so thanks to you all for your contributions. If I understand it correctly, there would appear to be no downside to making the feed hoses from each tank the same - even if the difference in lengths is a minimal contributor to uneven flow. The other challenge appears to be getting the cap vent angles correct on both sides so they are receiving even pressure from their angle of meeting the airflow. I imagine that the offsets would be minimal so will experiment a little with that.

Again thanks guys.

ross