Ha ha - funny you mention the board speed hump - i have notched up one of those to experience - repositioning the 4wd on the beach for a better view of the surf action - ouch $150 repair and a new fin box later...
Re: the SMIK, no mine is the economy version carbon rail and is slightly heavier - there wasn't much in it - i did the scale of justice - carbon in one hand and carbon rail in the other - kept the $370 difference in my pocket.
Here on the south coast of WA we get the 'odd breeze' so a touch more weight (few hundred grams) wasn't an issue for me.
Agreed on the 8'0 i was scared and spent about half an hour comparing and picking up the 8'6 x 31.5 134L back and forth. Dimensionally, there wasn't loads in it but there was a fair bit of extra
Volume in and around the shoulder and nose vis-a-vis that i did not think i required.
I would have been instantly happy on the 8'6 but have an 8'10 skate, so a bit of variety in the quiver with the 8'0.
Now all i need is a 9-10 footer - probably splurge on the carbon, unless any manufacturers are looking for a motivated advocate

with poor to average SUP skills to sponsor

Cheers
Eski