Tuanella III hits the water

Wednesday 26th June
At Deacons boat yard at the Bursildon Bridge on the River Hamble. Scheduled mast and boat lifts, work with a generally defined time, understandably took precedence and our lift, with issues relating to fitting the keel pod, loading that with lead ballast and hanging the rudder was left to the latter part of the day. Video clips of this, http://bit.ly/10sDocF , show this and her lowering into the water.
The good news is she appeared absolutely water-tight. The less than good news is her trim show her tail up a little and somewhat seriously shy of ballast. The workhorse boat of the yard is seen pushing her across to a work berth. Getting into her to tidy up and set the cover proved her to be worryingly tender. Towards the end of the clips is one showing my friend Ray, with little more than his hand on the cabin, getting her to rock easily.
In a certain vernacular one has to go back to the drawing board, certainly at least to the model, from which it is obvious I didn't extrapolate all, or least accurately information that was there for the taking.
When I tested the model I think a big glitch was determining the ballast.
I used the cube of the  length to scale up the cubic capacity ( 1: 7 ). Allowing that the ballast is a function of cubic capacity and that the weight of ballast that the model needs here................, in my bathtub this morning, for acceptable trim is ........., the cube of this is ..................

A Drascombe lugger near by in the yard and of the same length was some 2.5 the weight of Tuanella.
While she was stationed on the wharf I put 40 kg of bagged shingle aft as possible, and this settled her tail a couple of inches.
I think the position of the pod on the lubber line is too far forward. Changing this is something of a
structural challenge because the housing is an almost inviolate.
What comes to mind which could be possible is to use the support bars of the pod to hold an accessory pod or bar which goes aft.
Another worry, a miscalculation, is the amount of water that rises in the engine box. I thought it would be well down at a level with the lower runners but as she bounces around the level gets quite close, 3-4" from the top.