HEY NUG......I'm with ya on that ..
that board is 8.1 ,28 5/8 ,wide 103 litre .if factory .
new .8,0 is 28 3/4 ,99 ;litre ...or the new 8,4 ,29 3/4 ,111.6 litres .not far off your 8,5 by 30 .
mate if you can ride a smaller board go for it ..you will rip hard and faster .and less likely to grow out of it ..wish i could .
thats why I kept my 120 flow ,its always a challenge but it rips on the right day ..and you always leave the water with a smile on ya face .