A55 with the f42am flash
Have you tried using your flash with your A55 wirelessly with HSS?
I'm curiuos- I have the I have the HVL-F58AM.
It’s excellent- works fine remotely, even in HSS mode, with my A100.
And it works fine with my A55 in HSS when on camera, but all remote shots are underexposed.
There are a couple of threads on here suggesting it's a genuine bug that needs a frimware upgrade to fix.
The A55 HSS limitation is official:
See ( 14)
It applies to all Sony wireless flashes, and Minolta HS(D)s
It's not a problem with the A33.