Tog
Make sure you dont have any damage from hitting the ropes...those shafts should turn with one hand...ideally. Perfectly aligned engines/shafts ect should turn easily when the trannies are in neutral. Make sure your alignment is good or new bearings won't last long. Its generally recommended that you check this annually when the boat is in the water. In fact, with new cutlass bearings there will be more drag than with used ones. Hopefully its just rope pieces just caught up between the rubber in the bearing and shaft...another word of advice...never, ever start the engines on the hard and put the engines in gear. This will almost instantly fill those bearings. They need water for lubrication.
Is there any play in the shaft when you push up and down on the end where the prop is attached?