Felinfoel missed out on the extra point after scoring three tries in a testing 28-19 win at Penclawdd.
Tumble lost a nine try thriller 37-29 to third-placed Loughor despite leading 17-7 at half-time. A late penalty from Loughor's Ben Davis secured the bonus-point win after Stephen Hewitt had scored one try, three conversions and a penalty in a battling display from Tumble.
Mumbles remained fourth with a 14-6 victory against Gorseinon and Kidwelly had four tries disallowed in a tight 13-9 defeat at home to Pencoed. A late fight back from Pontyberem could not prevent a 15-13 defeat to Cwmavon.
West Laugharne took advantage of Ammanford's disappointing 36-10 defeat to Cardigan to move top of Division Three West after a five try, 31-17 win away at Lampeter. Third-placed Llyanybydder are just a point further back after they comfortably beat Llanelli Wanderers 17-0.
Bottom club Cwmgors were thrashed 93-5 by Aberystwyth while there were also wins for Amman United and Newcastle Emelyn.
In Division Four West league leaders Hendy were edged out 24-20 by bottom side Birchgrove as the visitors secured only their third win of the season. Morriston ran in five tries without reply to ease past Pembroke 34-9 to overtake Hendy at the top of the division. Llandelilo failed to take advantage of Hendy's defeat after they slipped to a 13-16 home defeat to lowly Tycroes.
Burry Port won the battle of the top two in Division Five West with a bonus-point 29-5 win against Cefneithen.