hey AW you've been busy !
is the list getting shorter or are you adding to it ??
The tank sure is a difficult one.
The lower half of the bike looks predominantly dark and I think such light colours at the top (seat and tank stripe) are making the bike look a bit 'top heavy' They look a bit isolated and not part of the bike as a whole somehow.?
I've always loved the 'Cunningham 'stripes on the racing E Type Jags but to work on your bike I think you would need to carry it through to the rear fender ...dammit mudguard
The seat is lovely but the colour choice has severely limited your options on colour scheme and I think you will need to make it look like the seat is part of a planned colour scheme .
I know this is not what you want to hear but if it were me I'd take the seat off the bike and then decide on what theme you want the bike to have (ie modern, traditional , utalitarian, retro, rat, etc etc then think about total colour scheme and then then see if the seat fits with the scheme as a whole . Otherwise the seat colour and your tank finish choice are likely to look isolated and not coordinated with the rest of the bike.
Well done all your hard work buddy you are an inspiration mate. I took the easy route cos I'm lazy and I really respect what you are trying to achieve with yours.