I use my AVX with SGP. I could never get any kind of connectivity to SGP with NexRemote. I use the AVX ASCOM driver. I don't think that NexRemote can connect at the same time you are trying to use the ASCOM driver.
Anyway the ASCOM driver works great - plate solving and centering, meridian flips, the works. Plus, PhD2 works great with the ASCOM driver simultaneously with SGP. I have not had a problem with this setup. Well, to be honest, you do need to connect through the physical hand control and I did break my home made cable (twice). Other than that no issues.
Oh I didn't mention - I get connectivity to SGP, ASCOM guiding with PhD2, and simultaneous connection to "The Sky" with the ASCOM driver. I couldn't be happier with the seamless operation (again except for breaking my cable twice).
Jim T.