The descent from 4 that drops down into Boltby is very muddy and as a resident of Boltby is one I avoid unless it is VERY dry, it’s not that exciting either!
Out of choice I would carry on past Boltby scar then drop down the extended blue route through the quarry (turn just before the building at High Barn). You will then meet the road just before point 6 before heading into the forest.
There are some unofficial off track bits in the forest but they are very hard to find. The route mapped should be fine but not very technical or challenging.
Also agree with the comment about the cafe at High Paradise being much better than the one at Sutton Bank.