Winger Richard Mayne grabbed his side's sixth and the final one came from hat-trick hero Campbell, after good work by Bell and replacement Neil Doak.
Meanwhile, Sunday's Well have not given up on reaching the play-offs. They are currently residing in fifth, following a 42-28 win at County Carlow.
The Corkmen thrived in what was a free-flowing, entertaining game at Oak Park, registering six tries through team captain David Twohig and winger Tom Parker, who scored two each, along with forwards John Moynihan and Chris Long.
Bottom side Carlow were still in the hunt at 17-8 at half-time, with assured full-back Billy Murphy scoring a try and a penalty, and further touchdowns from centre Ross Byrne and replacements Richie Whyte and Eddie Barron saw the midlanders deservedly pick up a try-scoring bonus point.
At Rifle Park, Banbridge won a well-contested Ulster derby against Portadown, emerging as 23-12 victors.
Young guns Stephen Irvine, Jonny Weir and Chris Leathem, who were part of Bann's Under-18 Ulster Cup-winning squad last season, all touched down as the hosts secured their seventh league win on the trot.
Click here to view video highlights from the Banbridge v Portadown game.
A vocal crowd at Shaw's Bridge watched Instonians take a 27-13 win over their provincial rivals Ards. First half tries from flanker David Bradford and hooker Stephen Douglas set 'Inst on their way, with Adam Telford adding a third after the break.
The first AIB League derby between Navan and Barnhall was a terrific encounter at Balreask Old, with the hosts battling back to claim a 25-24 win. A try from John Duffy, two minutes into injury-time, was converted brilliantly from near the touchline by Ryan Roberts for the deciding score.
Related Links -
AIB League: Division 3 Round-Up (February 13)