I really think the key to the 88s is practice. More time than i want to spend so I am just average at best.
I have seen a player or two consistently make hits at 8K. Around a base set it for 1.5K then wait for the plane to get in that range. That is kind of a one shut deal.
One time a few years back I watched a fellow Rook took out three bombers out with one shot about 5 K. Pure luck he shouted on the range radio. Never seen that since.