Glad you're enjoying it.
I think you will find whatever height you set the engine at you will get splashing - from looking at this in the past on here the unique Aerotec V that continues to the transom seems to channel water onto the leg and altering the height will not stop this.
However, this should not be coming over the transom with a 25mm or so shim. I don't think you can go much higher without modding the transom plates as the turnbuckles will be too high.
And as you note increasing the height will lead to ventilation in sharp turns sometimes, can't be avoided!
I'd strongly recommend doing the rubber floor mod, this firms up and flattens the floor - makes a big difference.
Also loads of places on these to clip on dry bags, fuel bladders etc to free up floor space. I clip ropes and bags to the bow rings and these tuck right out of the way in the forward bow space. And don't forget the 'storage pocket' under the floor - I carry the oars and 50ft of rope in there.
I think the thing to remember with the Aerotec is that it's marketed as a 'sports SIB', hence the narrow beam, 'performance hull', 45cm diameter tubes etc and really comes into it's own when driven this way (sporty) - ie rough water, chop, sharp turns at speed with much less slip etc.