We just added Trellis quantization to XUBC7 (supercompressed universal BC7) via AC truncation, as long as the PSNR drop is within a configurable channel-weighted PSNR window, and the PSNR doesn't fall below a lower limit. This helps at higher Q (DCT quality) levels.
Trellis quant is another video method we've ported successfully into GPU texture supercompression.
https://en.wikipedia.org/wiki/Trellis_quantization
This new encoder also supports several forms of block-level RDO (all optionally) for surprising gains.
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