It was the fourth consecutive year that Kent coach Steve Franks had brought the boys team to the competition, one of the few national team events for junior squash players.
They breezed through the southern qualifying stages in Brighton, winning all three games.
Kent were winners in the Under-11 category last year and three of those players were in the Under-13 team.
Alongside Christian was Dylan Roberts of Bexley Squash Club, Freddie Davis and Jude Gibbins of Beckenham, Freddie Miles of Thanet Squash Club and Veer Vaghela of Bromley.
The first game of the finals proved tougher than expected and Kent narrowly lost 3-2 to Yorkshire. The defeat meant that Kent were playing for fifth to eighth place.
An easy 5-0 win in the next game against Suffolk meant Kent took on Essex in the final game against Essex, which they lost 4-1.
Christian, 12, is at The Judd School in Tonbridge, and started playing squash aged five.
He was coached by Mary Scott-Millar at Holmewood House School in Langton Green and represented them at successive Independent Association of Prep Schools competitions.