Tiverton scored mid-way through the second half to make it 4-2 however Slimbridge went 5-2 ahead with minutes left.
Slimbridge 5 Tiverton 2
Top of the South and West:
Meanwhile in the HFA County Cup Lads Club are drawing with Westfields 1-1. Extra time to be played.
Westfields had captain Phil Glover sent off for violent conduct just after he equalised.