Damp, uneven and slippy doesn't bother me as long as it's flat.
Like the OP, I'm on a recumbent trike and being on three wheels makes a BIG difference as you cannot fall over.
Now pedalling along slowly with one wheel 3" from the canal bank on a narrow bit so people coming the other way can get passed can be a bit "interesting" ......
Where damp, uneven and slippy catches me out is on a climb.
There's not enough weight on the back wheel to give me a lot of excess traction.
So once the going gets iffy uphill, I just suffer badly from wheel spin/slip.
That's the reason I wear the back tyre out in half the distance that I can get out of the fronts, ~4,000 miles back vs ~8,000 miles front.
And thats with a heavier duty tyre on the back (Big Apple) vs the lighter ones on the front (Marathon Supreme).
Luck ........
