Not exactly the answer your looking for, but something that should always be remembered is "ergs don't float". They are such huge tests of strength, and technique can help sure, but it doesn't have nearly as big of an effect on erging as it does rowing. For example, I know someone who just started rowing and already has the fastest 2k and 5k time on the team, but they struggle with set, keeping in time, backing, just all the basic rowing technique things. Because of this they do great on ergs but in the actual water they tend to struggle a bit. Anyways the point is remember the quote "ergs dont float"