I upp LA-7s all the time in base defense, often desperate base defense. My tactics are always the same. If I can I get up to the 3k to 5k sweet spot, get my speed up, pull high G turns to dodge B&Z's, and wait for an enemy to make a mistake. This is the only time I fly LAs. I dont upp them and take them to other bases and the only exception is maybe TT when its up, and on my weekdays off when I get them. During the day on weekdays, with the kiddies in school, theres often a lot of talent at TT and you can learn something.
And when I upp an LA-7 I stray from base ack to get guys to commit. They say the LA-7 is a great low alt climber but my experience is that your always looking up for cons and if you go verticle to long then your bleeding E and your dead. A slow LA with high cons is a dead LA. So thats it. I lay there and wait for a Mustang to make a mistake. And the mistake is apparent right away, right away you know if you got him or not. He either stays to low for to long, to slow, gets to greedy, strays from his buddies, isn't aware of his 360%, or overestimates the capabilities of his airplane.
The LA-7 is probably the most one dimensional airplane I fly. Maybe the most one dimensional of the entire set. As long as you dont play "its" game you should be alright.