The UK competitor lifted the trophy at his second attempt following his third place last year.
His comfortable overnight points lead remained virtually unchanged by the finish, although there was a serious realignment of the minor places.
Jersey’s Paul Mollet finished third.
The 69-strong clubman class was a closer call, with a tie for top spot being settled on a countback on the number of cleans.
Visitor Shane Lovett took the class by two cleans leaving Rod Broom the bridesmaid again, Glen Hamel was Jersey’s top rider, finishing in fourth place.
The trial followed the usual format of three laps of 20 sections.
Half of Saturday’s 20 sections were at the exposed rock/dirt face of Jubilee Hill and the similar but slightly muddier terrain on the adjacent Mont Rossignol.
The remainder were in woods in St Peter’s Valley – and the forecast rain duly arrived, at the start of lap two.
Scores escalated as the rain turned the steep hillside sections near the duck pond in the valley into mud-covered ski slopes.
Ducks hid and riders were having difficulty getting between sections, let alone ride them.
This big scoring day ended with Chris Curtis on 108 points and comeback kid Jerseyman Paul Mollet on 129.
Clubmen Lovett and Broom were on 58 and 65 respectively.
Sunday’s sections, raced in bright sunshine, were at Le Saie and La Ferme valleys, which were remarkably dry this year.
Experts were in trouble from the start with a small rock step on section one.
The short approach earned most riders one maximum points visit, though for Dave Fry and Nick Life with their returns of one and three, it was an indication of a great comeback, securing two of the lowest scores of the day.
Along with Curtis, they carded half the scores of most fellow-riders.
Fry clean-carded 30 sections to move up three places, just taking second spot from Mollet.
Life’s performance moved him up from tenth to fourth.
Dave Clinkard, in third place overnight, supplied some early entertainment dropping his Beta on Freddie’s Rock – in front of an audibly appreciative audience of some 30 riders and spectators.
His day did not improve and he eventually dropped three places with one of the biggest scores of the day.
Section 17 was tough for the clubmen but a nightmare for the experts.
There were maximums for nearly everyone, though Mollet and crash-stylist Jamie Jones managed to foot through.
There were only three cleans – and Curtis got them all.
Earlier on the final circuit Guernseyman Tom Scott wiped out big time on the rock step and he had Jersey man Mollet to help him extricate his machine from under a very large log.
The 40+ Mollet was overheard saying to the youngster: ‘You should be looking after me!’ The only female rider, Kayleigh Price, really impressed with her bike control (brute force not being an option), and it’s worth noting that most of the 20 Channel Islanders – all but three of them – were beaten by her.
