Your boat looks to be riding OK to me!
In fact, if anything, it's the stern that's plonked firmly in the water rather than the bow being too high. I'm going to stick my neck out and estimate your speed in the two side-on photos as no more than low 30's (knots)?
I usually trim to lighten the steering, then match the trim to the conditions. Like Simon has said, only keep the trim "in" or "down" in a head sea. In good conditions, carry on trimming out gently and watch the speed rise slowly.
Alan - I suspect Codprawn may have the Rapier hull rather than the Giggleswick/Wrigglesworth/Temptress hull? But I'm just guessing here! Hope it's laminated better than Ferryman!