Not sure if you were playing at the time we changed nations. It was still pretty early in the game, 1st rates were rare. We would get the odd screening help from other DK clans, but mostly in frigates or the sorts.
On the day of the swap, DK was maybe capable of showing up in a bunch heavy frigates / connies or the like. No where close to fielding a 1st rate fleet.
So yes, in hindsight I regret taking them off friendlist, simply because you keep thinking it would have made a difference. It would have not made a difference, at all. It was just a douche-move by us as a thank you for their douche moves