Saltash followed up their victory over the Falmouth Eagles at the Recreation Ground earlier in the season with a 27-13 win on their own patch against Phil Angove's side.
The result narrows the gap between the Ashes in 7th and the Eagles in 5th to just six points as the season approaches its climax.
Elsewhere Exeter University's apparently unstoppable march to the Cornwall and Devon League title continued at home against Hayle, with the Students running out comfortable 52-12 winners.
Pirates Amateurs eased past bottom club Veor 31014 at the Mennaye, and Newquay were narrowly beaten away at OPMS 16-13.
Full Cornwall and Devon League results were as follows:
Exeter University 52 - 12 Hayle
Honiton 25 - 12 Crediton
Old Plymothian & Mannamedian 16 - 13 Newquay Hornets
Pirates Amateurs 31 - 14 Veor
Saltash 27 - 13 Falmouth
Tiverton 14 - 13 Withycombe