totally agree with the volume thing ...colas.
i switch from board to board ...8'8 x32 @ 140 litres ,8'7 120 litre flow ,8'10 130 litre flow
as colas says ...the 140litre 8'8 x32 even though small in length does fell corky or like a barrel .you can get bucked off it quite easy ,it is the looses of the 3 .huge rocker ,but you have to paddle hard to catch waves ...
the 130 flow is the easies to catch waves ,ride them ,but at 95 kg i have trouble getting it to turn real sharp.it feels big for me ,which is a shame .as it will handle rough and any conditions ,I will use it as a big wave board .i wish it was narrower ...same as the 8'7
which leave me with the 120 flow ,
i wish it had 5 more litres for my ability ,30.5 wide is ok ,as the board really rips ,but I sink it ,which makes it difficult to ride in all condition ,I Weighed my wet wet suit helmet ,paddle .it brought me over 100kgs ,I'M LOOKING forward to summer to lighten the load ,so i can ride this board more .i think i have found my boundary mark .
i doubt if i would every go below 120 ...litres for my weight ...or maybe i need to find other boards ...

or get better.at riding what I've got.
i would not want to ride bigger than 130 litre either ...for my weight.keeping in mind we are both advanced riders