sorry i have been quite busy.....i assume that you put those little flaps to fill in the recessed corners and be able to have a lower, straighter hairline.
the problem i see in that and this is just my opinion, others do it and feel it looks fine....is that you will still have a wide forehead which makes it all look off.
i think if the corners are filled, the hairline is lowered and is straightish with a tiny bit of recession then the width of the forehead needs to be addressed as well. that is achieved with longer, larger flaps that replaces the side recession including the temple points. in your case it looks like they are strong but have moved back maintaining their shape though.

with my first stock piece (from another seller) i made my template to include those little corner flaps. to me it really didnt look good. the width of my forehead just made it look like off. a hairline with that sort of contour and very little corner recession is not seen with a wide forehead naturally. some may argure that hairlines come in all shapes and sizes and this is true...but there are those that look weird and i dont think anybody wants to replicate that and possibly draw attention.

this first pic is a mock up to give you an idea of what your template would look like as a piece... i followed the exact lines that you made in black on the plastic....not to natural IMO...
the 2nd is where i added some recession which i feel dramatically improves the appearance...keep in mind that you will still have a wide ish forehead but i think it would look fine..
the 3rd pic is what i think you are shooting for (its a bit rough)...a narrowed forehead and filled in corners....
i'm pretty sure you can see just how much more flap there is....
i'm not a huge fan of big flaps such as that. i think if done properly they can make a world of difference though.
the problem is now not only does one have to be concerned with getting a good hairline attachment (if exposing it) but now there is the equivalent of two more hairlines to be concerned with.
i hope my mock ups are of use to you and if you need more assistance i am happy to help

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i should also mention...it is true that if you wrinkle your forehead that does show where your hairline once was....(no offense paul, you give some great and detailed info) what i dont think many realize is that it is where your hairline was LONG ago, meaning as a teenager. when using that method IMO it should be moved back by at least a 1/4' to 1/2'...otherwise one ends up with a very low hairline,,,not only that but its also long....meaning it has to extend back to the side hair...and again this does nothing to address the sides.....