I have one of the other 9.8's. I actually had 2 of the 9.8's but sold one to a boardie here about a month ago.
Since I have a goal to complete my ASM run including all variants, part of me wants to keep it. However, not including variants, I am only about 20 ASM issues away from having a full core run, and i could sell this to fill in those gaps.
I've looked at my 9.8 over and over and dont see a spine tick that jumps out, but the one i sold to a boardie does in fact have a couple noticable. My guess is that between the low run number we think this had, I also think many shops just tossed them on the shelves carelessly, causing slight damage to them.
This the one i currently have:
This is the one i sold to a boardie: