Seems there was a lot of resistance in the water when I converted ROV from ordinary to heavy. And it was easy to hang up in objects since I did not have the heavy protection.
found that one could turn the plates with the half moon recesses the opposite way. and pull the plates completely together. Then there was room to mount the engines both front and back. and that the float element could be mounted again on top of the plate.
All wires are moving to the top of the plate and make the underside smooth and without resistance.
With this wire assembly, one also gets longer wire when removing the main tube.
Have also turned the engines slightly so that they are slightly less than 45 degrees. to get more speed ahead.
Have had it on a small test trip and there is a lot of less resistance in the water.