That route would suit me more than your original draft, though I don't know the detail for a lot of it. There is a fair few long stretches of unsurfaced trail, the sections in green, I tend to avoid these unless I know what the surface will be like, or I have a lot of time, sometimes they're fine, but other times a 10km stretch of muddy track can add an hour to your day. You can avoid these by choosing "Paved" from the menu on the left. There's also some urban areas that will slow you down and sometimes it just takes a bit of tweaking to avoid them.
What I would do - I'd save that route, then go through it and see where there's a stretch of B road, or short stretch of A, that the mapping is avoiding, such as the stretch from Pershore to Evesham. The routing has even chosen some trails over minor roads, which you might tweak, such as retracing to Selby after your overnight stop, rather than the obvious direct route North. These are minor adjustments, but at some point you might resent the extra mile. There's no reason not to set off with a route A and a route B, as long as there's plenty of opportunity to switch between them. That's what we did, pre GPS days and highlighted on pages from a road atlas.
Overnight in Seahouses, I hope you like Fish & Chips, every other shop is a chippy, and some of the best in the country, Neptune for the trad feel, Lewis's for something a bit special, those are my recommendations, though there's plenty of others and I haven't tried them all. From Seahouses, you've by-passed Bamburgh Castle, one of England's finest, worth the couple of miles just to ride past, you might need it to work off the fish and chips!
Have a great ride.