Change to the official rule on "Ship collisions":
Due to the enormous amounts of damage caused by dragging B markers in friendly ship collisions versus no damage in enemy ships, we have established the following solution: ALL collisions cause damage between ships. However, basically 2 C damage markers, which mainly cause damage to the rigging. With the addition of causing additional damage to smaller ships for ships of different sizes: If there is a difference of 1 point in hull strength, the regular 2 C-marker damage remains. For each additional point, the smaller ship must draw +1 C damage tokens.
Reducing this amount of damage is possible by previously planning a boarding action. This action suggests anticipation of the collision and attempts by the crews to minimize damage to the rigging and ship. Therefore, 1 C marker may be chosen and placed back in the bag. However, this can only be done once per round. If two collisions hit the ship in one turn, only 1 damage token can be replaced.

Reduced damage in collisions with down feathering:
If both ships only have Slight Sails or Anchors active at the time of the collision, then the damage on both ships is flatly reduced by -1 C marker!
Of course, this also applies to collisions with wrecks!