Actually I do it more often or not without getting killed. The secret? The Yak9T alt, speed and patience. A small field can be de-acked in a short time. If there are tons of uppers it requires a wingman or two to keep your tail clear, if your by yourself it is not happening. The T's gun lets you pop guns from real high alt, then zoom back up without exposing yourself to the ack for too long or the bottom feeders.