I think it is inadvisable to run full tabs once on the plane due to; (a) making her bow-down and therefore increasing drag and so being less efficient, and ( stress on the tab rams. I'm pretty sure that the Eltrim system I have on Serenity is not meant to be used with full tab in excess of 20 kts due to the potential for damage to the rams.
I use full tab to get her up, then quickly reduce to little or no tab once there. Last time out at sea, a large following swell meant I couldn't go much faster than 16kts, so lots of tab were used there to keep her planing, but on Breydon I wouldn't have thought you'd need much at all. (It seems I may suffer Davids wrath for this, but it was the most comfortable set up that still allowed us to plane and keep on top of the waves).