Yeah it will be more stable.
The jc longboard works well in 1ft i often go out with my wife who wont surf anything over 2ft so quiet often im using it on 1ft stuff.
When it is small i chuck in a 10inch fcs2 fin and just cruise.
Im 94kgs and my jc longboard is 115L when i first got it i was around 98kg.
Its the board i find i ride the most.
Funnsurfing ...your board sound interesting. do you have photo?
it seems as we get bit more comfortable on our long boards you almost need to go custom to get width below 28 and volume around 100
i have 9 laird surfer which is really nice - but i am 78kgs and its volume is 120 litres - so i am thinking of custom say 9 6, less than 28 wide , and maybe 100/105 volume