Looks like a good trip to me!
(As pointed out, that map doesn't really work don't follow it! - there is a spur down from Kings Norton to Stourport that should be replaced by a spur down from Lapworth to Stratford).
I would certainly plan to stop in centre of Brum - it's an essential canal experience (in a good way) and centre is safe.
Likewise, a night in Bancroft Basin (Stratford) is a memorable stop.
Just a thought....You might want to consider going anti-clock. When doing a 'ring with a detour' like this, I tend to leave the detour part until later in the trip, because that's the section I can adjust if necessary to match circumstances and progress made at the time.
Another thought.... If you begin to feel this is a bit too demanding, you could replace your trip down the Stratford with an easier detour up the Ashby. You could even make this decision a couple of days into the trip if you wanted to.
The good news is there are around 8 million quite decent tourist attractions on your route.
Ones I would visit are:
Cape of Good Hope - Warwick
Two Boats - Long Itchington
Tom O'The Wood - Rowington (or alternatively Navigation Inn at Lapworth)
Fleurs De Leys - Lowsonford
Dirty Duck - Stratford
Blue Bell Cider House - Earlswood
Tap and Spile - Gas St Basin (but countless alternatives)
Dog and Doublet - Bodymoor Heath
Get busy on Canalplan and Google and get at least a rough idea of an itinerary.
If you have a plan (some people don't believe in them, I know) then you can relax properly knowing that you are on schedule, or get a bit of a wriggle on if necessary.
Enjoy.