hmm, not sure what git mapconv is, but I really suggest using behe's mapconv. You can dl it from springfiles.
32x32 is way too big for most *A mods, for example BA, XTA, CA, SA. If its your intention to make epic big ass map then ok, but dont execpt to be played a lot.
If your intention is it to be for massess, then reduce the size drastically. I think 16x16 would be good for 3way...
I would go 2.2/sec per metal patch for metal income. (BA income)
And yes dude. I see your image now. Its highly compressed! Change compiler right away and your problem will be fixed!
Oh, yes.. and couple trees wouldnt hurt your map :)
*wink wink*
http://springrts.com/phpbb/viewtopic.php?f=13&t=22149