Generating 1080p@30Hz from ADV7511
So far, the text above contains only statements, and no question. I would guess that your current set up is not working and you want to know why.

I think it is essential to provide an exact 74.25MHz pixel rate, since the IC is capable to detect and re-shape the banking of the raw frames. This clock deviation may prevent the chip to detect the video mode, so it will not generate any output.

I would first check the 0x3E [7:2] register to see if the device detects any video mode.

Another guess, could be that your display does not support the 1080p@30 video mode. I have been using ADV7511 with Dell monitor, and it does not support any of the 30fps modes.