I probably wouldn't make it an I/D map, personally. Thats mostly due to there being relativly few AvD maps compared to I/D, though, and not because it wouldn't suit the map
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CP2/3 could probably stand to be a bit more defensive in nature, I guess. All 3 CP's are prone to being easily capped by a decent long-range jump, doesn't matter so much for CP1 I guess.
Bucket caps help a bit, not convinced they're a perfect solution though. Not really any easy way aside from that to alter things without a major rework though, CP3 especially.
I'll think on it for a bit and get back to you