CSE... I have a different take on the 8'10 Speeed vs 8'10 Flow
I could never ride my 8'10 Speeed in my full winter gear.... to tough for me.(I ride a 9'2 Speeed in winter now)
But, I am riding my 8'10 Flow in full winter gear and find it much easier than the 8'10 Speeed.
Both of them have plenty of float for him.... but the extra width of the Flow will make the transition easier.
And as was stated earlier.... it will have a similar feel as his shortboards.
Just put tape on the boards and write 8'0 on the side