Problem with layering order in Gmax ground poly

(Cross-posted on scenerydesign.org)I'm attempting to do some corrective ground poly creation at KRDG, and I've run across a problem that I can't seem to get around. For various reasons I'm adding a Gmax-produced poly of a parking lot to an area that has no parking at all in the default airport. I'm using Arno's tip for replacing the "ADDOBJ" code in my asm file with ADDCAT and specifying the layer on which to draw my object. However, no matter how far down I set the layer order for my new poly, it always lays over the top of the existing taxiways. I've gone down as far as layer 1, so I don't think I can sink much lower! The poly is for pavement that intersects with the taxiways, so it's important that they have layering precedence, but no can do. Anyone else run into this yet in FS9 or have any advice? I've included my asm source code so you can try out what I mean. Look for the poly at the south end of the field near the control tower.