Next board dimensions - hybrid for kid

Hey all!
My son is surfing a Solid Lunch Break 5'4 20.87 x 2.38 30.6L (stock) as a thruster. He's been on it for a couple summers, he can catch lefts and rights, 1-3' waves, trim down the line, and is starting to working his turns decently well. He's small, 5' 78 lbs, 13 y/o small for his age. Trying to decide what to do for his next board. Could go custom, but not necessary.
He has a cruisey style, and isn't gonna be super vertical, just not his way, he's not really a daredevil. Seems like he should use a little narrower nose. The groveller has great stability and paddle for him, but that bottom turn and cutback could benefit from a little less board. I'm sure plenty of that is on his technique. I'm worried that if he goes too narrow or goes down too much in volume, it might not be worth it.
I was thinking stay 5'4" or go 5'6", the 5'4 dims were 19 7/8 wide, 2 1/4 thick 25 liters, the 5'6 of the same board is 20" x 2 7/16 27.9 liters. Both had a squash tail like his current board, EPS like his current board, seems like more rocker and definitely a narrower nose. We can see his Lunch Break, but I'd like him to get just a little more turning. No delusions of contests or going pro, just like to see him be able to get some more maneuverabilty (and make duck diving a little easier. NJ beach break. He gets out most days, way more in the summer before school & sports book up time - with cover, he's gonna end up surfing well into Oct/Nov since there's less to do.
Anyway, 5'4 25L or the 5'6 27.9L a good next step?
My son is surfing a Solid Lunch Break 5'4 20.87 x 2.38 30.6L (stock) as a thruster. He's been on it for a couple summers, he can catch lefts and rights, 1-3' waves, trim down the line, and is starting to working his turns decently well. He's small, 5' 78 lbs, 13 y/o small for his age. Trying to decide what to do for his next board. Could go custom, but not necessary.
He has a cruisey style, and isn't gonna be super vertical, just not his way, he's not really a daredevil. Seems like he should use a little narrower nose. The groveller has great stability and paddle for him, but that bottom turn and cutback could benefit from a little less board. I'm sure plenty of that is on his technique. I'm worried that if he goes too narrow or goes down too much in volume, it might not be worth it.
I was thinking stay 5'4" or go 5'6", the 5'4 dims were 19 7/8 wide, 2 1/4 thick 25 liters, the 5'6 of the same board is 20" x 2 7/16 27.9 liters. Both had a squash tail like his current board, EPS like his current board, seems like more rocker and definitely a narrower nose. We can see his Lunch Break, but I'd like him to get just a little more turning. No delusions of contests or going pro, just like to see him be able to get some more maneuverabilty (and make duck diving a little easier. NJ beach break. He gets out most days, way more in the summer before school & sports book up time - with cover, he's gonna end up surfing well into Oct/Nov since there's less to do.
Anyway, 5'4 25L or the 5'6 27.9L a good next step?