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THEY AREN'T REAL
(slrpnk.net)
for the non-pedologists:
Sandy clay is a textural box on the soil triangle. It's small and requires the absence of silt. The reason we joke about them not existing is because of the size of the box and how far apart the two grain sizes are. There are very few scenarios where sand and clay would be deposited and not silt.
This might help
The high amount of humus you indicated makes things feel finer than they are. If you keep smearing or rubbing though it breaks down in your hand and you're left with nothing. Work with what is left over.
In general, SL to SiL is fine for veggies. CL even, but you have to be careful with watering.
LS is too coarse and you'll have trouble with water retention