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I have my eye on a 5'11" Lost Quiver Killer as it looks like a fairly forgiving board as a back up for a ments boat trip
Quick question on volume (again!)

d.adroll.com/cm/r/out d.adroll.com/cm/b/out d.adroll.com/cm/x/out d.adroll.com/cm/l/out d.adroll.com/cm/o/out d.adroll.com/cm/g/out?google_nid=adroll5

5' 11" 20 0" 2 7/16" 31.50 LTR
5' 11" 20 3/8 2 9/16" 34.3 LTR

Above are the 2 dims for the 5'11"

I am pretty fit for my age (47) and am 175cm 75kegs.
What real time effect does the extra volume have on a board like this?
My last trip to indo I struggled with all the paddling so am looking at getting a little more float.
I normally surf 27 to 30 ltr.
Do I go five eleven at 34 ltr or am I better off getting volume up by getting say a 6 or 6'1"?

Any suggestions appreciated.

I reckon a 5'11 at 34.3 liters would feel very corky for the Ments (though probably ok for a summer beach break board/ groveler). It's all about plan shape and foam distribution and the same volume would be fine if the board was say 6'8.

I am 42 and weigh about 84 kg. I had a custom 6'5 with 35L of float made for my boat trip to the Ments a couple of years ago and I also picked up a secondhand JS 6'2 rounded pin at 32.5L. The 6'2 was my preferred board for the Ments and I found the 6'5 a bit over-volumed for my weight (makes it hard to get a rail in on a step drop) though it does paddle really well.