Thanks for all the replies... Info is a week late due to the weather, but here we go.
The engine is offset 1inch.
The Cavitation Plate is 1 & 1/4inch Above the hull line.
The prop is a Mercury Lazer II and is a 19P... and has 48-16544 on it.
There engine is fitted with 1 inch to spare on the top of the transome.
Downhilldai... is this the same as yours ??
To claryify... It dives left, regardless of trim...
I'm now thinking, move the engine accross by 1/2 or maybe 1 inch and down by 1/2 inch maybe 1 inch.
You thoughts please !