Just plotting a route to hit all these piddling gaps is going to take longer than riding it.
I find it much easier to plan than to actually bother going for the ride. I've had my next 6 tile hunting rides planned for over a year, just CBA (and don't have the time) to get out there and do them.
I think I went through it a while back, will go find the links.
I use gpxeditor.co.uk to plot the routes and display the tiles, but I wrote something that downloaded my explorer KML file from VV and then parsed it into individual "islands" around the unvisited tiles.
I find it much easier to plan than to actually bother going for the ride. I've had my next 6 tile hunting rides planned for over a year, just CBA (and don't have the time) to get out there and do them.
I end up with loads of stuff like: