From reading your previous thread, am I correct that you only weight 70kg?
Speaking as another relative light weight, at around 78kg, my experience is that a 160 litre board is BLOODY ENORMOUS.
Might be alright for these 100kg guys, but for us smaller guys having that amount of volume makes the board ridiculously corky in the surf, and almost impossible to bury a rail.
I have gone from a 10'6 Nalu at 160l to a 10' Style at 130l, to now riding a 9'6 Style at 112l, and I would pick the 9'6 Style any day of the week.
In the surf it is the most stable of the 3 at my weight, even though it is the narrowest. It also has the best glide, and is the most manoeuvrable.
BTW I am just a weekend hacker.
Dont get fooled into thinking that more volume equals more stability, because it doesn't.
In the Speeed, for me, the most comfortable size is the 8'5, which I think would be even more comfortable if it were around 105l instead of its current 112l
Sorry if this just adds to the confusion. As always, demo if possible