I'm shooting for sub 20 on as close to 320 as I can on the TT bike. The UK TT folks doing 30mph on 300w on a TT bike is usually those super dangerous motorway TT's with 60mph or faster vehicles whizzing by every few seconds. No wonder.
Still some work to do on both efficiency and the old engine. The engine will require the kids get to high school so I can increase training volume. They take a good bit of time these days, which is fine as it is their golden years of spending time with us since they want to at the younger age versus be forced to.