You could make the ratchet out of rubber too
, it'd help the 'bounce back' effect
...
Had any joy finding low resistance no~return valves?, there lies the easiest path
...
What do you think of having the outlet shaped as a funnel?
O>-*, instead of a circle with the outlet flush?
O-* . do you think it'd improve matters?, or would the bulk of the water in the > part retard flow?...
It'd work either way though, that's the important part...
*The
- part (barb) is supposed to be central, as in a standard configuration...