The 28-year-old finished on a nine-under par total of 275 which earned him joint 35th in the final standings at the Cleydael Golf and Country Club on the outskirts of Antwerp.
It could have been even better for Kellett whose final round of 72 was his poorest of the week and followed rounds of 67, 68 and 68 which had left him just outside the top 10 going into the closing 18 holes.
Ross said: “To finish up joint 35th but still on nine under par just shows you the standard of the Challenge Tour - the depth of the tour and the standard of the guys that are playing on it.
“In the final round I started off really well and got under par but then possibly let it slip a little bit on the back nine.
“I was missing putts which I had been holing in the first few days and that set me back a bit.
“But overall it was a good week’s work and gives me something to build on for the next few weeks when I am playing five tournaments in a row.
“After playing in France this week I’m back in Scotland for the next event, which is nice, and then play in Denmark, Slovakia and Tenerife.”
This week’s event is the Najeti Open at Saint Omer, near Calais, which gets under way on Thursdsay.
Then it’s back home for the SSE Scottish Hydro Challenge at the Spey Valley in Aviemore from June 23-26.
Ross continued: “Belgium was my best week of the year so far but I’m pleased with my game as a whole at the moment, having made three cuts out of the last five and being under par.
“I played at Saint Omer last year and it’s a tricky course. On a lot of the courses recently scores have been well under par so this might be a bit different.
“I feel my game is in good shape. I missed a few tournaments because I didn’t qualify as a result of my finishing position from last year - which was disappointing - but I’ve not a good run of tournaments to focus on.
“Playing back in Scotland is always enjoyable and the course at Spey Valley is one I’m comfortable on.
“I finished in the top 15 last year so hopefully I can do well again.”
Ross said he wanted to thank sponsors Aberdeen Asset Management, Paul Lawrie Foundation and Blue Group Machinery for all their support.