Dolby matrixed audio on modern equipment

Hi all, I recently purchased the Onkyo TXNR626 refurbed from A4L. It does everything perfectly…that is except all my prized LD 2.0 matrixed tracks, or even DVDs in 2.0 surround with flags.
When I engage DPLII cinema or NEO:6 there is consistent channel bleeding from the center to the rears, and despite having better low end Neo: 6 tries to create a phantom rear center which makes it less useable than PLII.
I tried my old outboard DPLI decoders which only output RCAs and they work fine-only trouble is that the Onkyo only has a digital input!

I also found that the unit picks up on the Dolby surround flags but apparently there is no mode that will play them nor a direct auto format sensing mode like on my nearly 20 year old Sony receiver.

I guess I’ve got to go round with an SPL and set everything, but I just read that old DPL receivers actually cut power to the surrounds in PLI mode so that you got that proper center channel emphasis with only a minor emphasis on the mono rear.

Any suggestions? This is driving me nuts!

Apparently this is the new norm. I fixed the bleeding as my levels had been zeroed out, but it still feels off somehow. Oddly when it plays a flagged DVD track the info bar shows the incoming audio as Dolby surround but it can only output 2.0 or I have to turn on DPL2.

I have a couple-year-old pioneer that will still do pro logic, but it’s not automatic. It’s like a legacy pro logic mode under plii. The auto surround mode defaults to plii movie mode, but can be set to pro logic. I have the Pioneer VSX-1021K.