Bonneville Seat Issue

I've got a 2012 Bonnie and fitting the seat has always been a right pain, when I had the standard seat it would take quite a bit of wiggling to remove it and getting the front tab and the 2 hook brackets to all align to refit it would take much pushing, removing, refitting, swearing and sweating to get it to fit right. I did wonder if it was the seat that was wrong so I bought a skinny seat from Motone and that was also a pain to fit but I now discover I can't get it off, it seems to be stuck on those 2 centre hooks and it's not budging. Has anyone else had these issues or is it just something to do with my bike? Also has anyone got any suggestions to remove the seat without breaking anything?
I will point out here that I have contacted Sam at Motone and he seemed quite surprised by this, also I have bought loads of bits from him before and everything has fitted and functioned perfectly so I'm inclined to think if there is an issue it's to do with the bike and not the seat. Whatever though I'm a bit baffled at the mo.

 

I wonder if the 2010 seat was different to the 2012, mines held on with 2 bolts at the back and should just slide backwards then lift off, I can't see where a cable release might go.

 

I did eventually get the seat off but it involved being a bit brutal with an old style flat tyre lever! No damage was incurred to anything but I will be modifying those seat brackets before it goes back on. I did have a chat with a mate who's a bike mechanic and an ex Bonneville owner and he's noticed that while his seat went on and off easily even with the standard seat mine is a right pain to fit, he has also noticed that customers' bikes can be pretty variable too so we're wondering if the frames are built in a jig but that crossmember where the 2 middle seat hooks go is just dropped in place and welded so can be a bit variable? We can't think of any other reason why there should be so much difference