But I get audio even when
they are summed together!!! i.e There is no sideband suppression.

There is no sideband suppression with I/Q demodulation until you get
your carrier synchronized to the transmitter's carrier. If there's no
mechanism for doing this, you don't get sideband suppresion through I/Q
demodulation. (Well, you may experience rapid fading if you're within
a few Hz, but I don't think you want that!)

There are some homebrewers who do not-completely-suppressed carrier
with synchronous detection. It's sort of SSB but not traditional ham
radio SSB. In traditional ham radio SSB you try to suppress as much of
the carrier as you can, and this won't help you synchronously
demodulate it.

Without that synchronization, just use a bandpass (IF+300 Hz to IF+3000
Hz for example for USB).

Tim.