Making it go
How do i make the rocket go? I've got 3389 (White Whale) and its a really nice boat to sail. Unfortunately i can't make her go, i'm positive its something that i'm not doing but i can't think of what it might be. We seem to go well in a good blow but up until that the boat seems a bit sluggish and doesn't pickup on the gusts as i'd expect.
2 things come to mind. Check the front tank isn't full of water (silly maybe but been there done that) have a look at your mast rake, in case what you think is your upright powered up setting is in fact 2 ft of rake. A flat main if you are on the heavy side is unhelpful.
Even though I'm a dog here's my thoughts
You can tell from the wake if you need to move forward, it should leave the transom cleanly without a lot of bubbling and turbulence. Incidentally, the thwart in a Merlin may look like a nice seat for the crew but in lighter conditions you have to be a lot further forward than that, if there's not enough wind to both be on the side deck I helm from in front of it, move back downwind once the boat is actually planing and the bow wants to lift.
Thwart position varies on Merlins, some of the nose diving designs are further back,Wine vis Cant. 5ins.(to keep the helm back). We sail with 25st.so I lengthen and work on the spreaders.
You could also try lifting the c/board and check the rudder for weed...a very effective brake, especially in light airs.