I owned a V10L and briefly flirted with the idea of getting a V12, ...twice, they are very quick on the flat and I think the bucket was more comfy for me.
If you are predominantly paddling/racing downwind or in calm conditions the V12 would be hard to go past.
If like me a lot of your training and racing is in cross winds get the lower volume V10L, it is ideal for that, the V12 front end is like having a sail out there and as soon as that nose lifts it gets turned by the wind.
Your height and weight do point more towards the V10L, a mate of mine has a V10 and is about the same weight, looks like he's always paddling uphill, the more forward bucket in the V10L suits the smaller paddler.
Always looking for the next boat