"After the Andorra trial, getting the good sensations back was very important for me and I struggled to be comfortable in this trial," Bou said.
"Yesterday I got the pole and today I was able to ride well on the bike and managed a zero on lap two. Everything has gone very well and this victory is very important for the championship. I also want to congratulate Jaime for joining me on the podium. He has an incredible level and I knew that these good results would come. It has been a very good weekend and I am very happy about how everything went."
Sections one and fifteen were man-made in the town centre and took few marks, but the remainder - comprising rocky outcrops on a wooded hillside - proved costly in the wet conditions of the opening lap.
Never in contention for the win after an expensive opening lap that saw him part with thirty-six on observation and five on time, Spain's Jaime Busto - Repsol Honda backed up his debut podium at TrialGP Andorra with a fighting third place, his solid second lap of just seven placing him four marks ahead of Japanese team-mate Takahisa Fujinami.
"I am very happy because it has been a difficult trial for me," Busto said. "I had damaged ribs from the Andorra trial, and they caused me a lot of pain, even so, once in the competition I was able to handle the whole event quite well. The sections, on the first lap were fine, and after drying out it got a bit easier."
Jeroni Fajardo - Vertigo was a further three marks adrift in fifth before a big gap to his fellow Spaniard Albert Cabestany - Sherco who, starting first following his qualification nightmare yesterday, showed great form to end the day with sixty-seven marks lost.
Spain's Miquel Gelabert - Sherco parted with seventy-four marks for a career best equalling seventh ahead of Franz Kadlec - Gas Gas from Germany on eighty-one, Italy's Matteo Grattarola - Gas Gas on eighty-four and a disappointed James Dabill - Gas Gas from Britain who, after finishing third in qualification, rounded out the top ten on eighty-five marks.
Spain's Gabriel Marcelli - Montesa parted with twenty-nine marks to hand him a four-mark victory in Trial2 ahead of Iwan Roberts - Beta from Britain who extended his series lead. Italy's Luca Petrella - TRRS was third on forty-two.
In Trial125 Fabien Poirot - Gas Gas dropped twenty-six marks to take a popular home win with a narrow one-mark victory from Italian Lorenzo Gandola - Scorpa who overcame a disaster in qualification to retain his series lead over Britain's Billy Green - Beta who finished third on thirty-two.
In the inaugural FIM TrialE Cup for electric motorcycles, riding the same course as Trial125, 1996 FIM Trial World Champion Marc Colomer - Gas Gas destroyed the opposition.
Dropping just nineteen marks, the Spanish legend - who retired from the top-flight fourteen years ago - finished forty-eight marks ahead of compatriot Cesar Panicot - Mecatecno who finished one mark clear of France's Bastien Hieyte - Electric Motion.
The 2017 TrialGP series will now pause briefly before heading to Great Britain for round five in two weeks time.
GP France 17
Pos. Rider Num Nation Time/Gap
1 Bou Toni 1 SPA 21
2 Raga Adam 67 SPA 39
3 Busto Jaime 69 SPA 48
4 Fujinami Takahisa 3 JPN 52
5 Fajardo Jeroni 47 SPA 55
6 Cabestany Albert 37 SPA 67
7 Gelabert Miquel 10 SPA 74
8 Kadlec Franz 11 GER 87
9 Grattarola Matteo 9 ITA 87
10 Dabill James 7 GBR 92
11 Noguera Oriol 15 SPA 94
12 Bincaz Benoit 16 FRA 94
13 Farre Arnau 19 SPA 99
14 Ferrer Alexandre 13 FRA 100
15 Karlsson Eddie 12 SWE 102
16 Casales Jorge 33 SPA 109
17 Gubian Loris 14 FRA 109
18 Price Jack 34 GBR 116
Top 10 Rider Standings
1 Bou Toni SPA 80
2 Raga Adam SPA 60
3 Fajardo Jeroni SPA 37
4 Cabestany Albert SPA 35
5 Fujinami Takahisa JPN 20
6 Dabill James GBR 19
7 Busto Jaime SPA 15
8 Kadlec Franz GER 5
9 Ferrer Alexandre FRA 4
10 Gubian Loris FRA 1