Ditto what everyone else stated. Your hexies take care of your quilting.

Yes, it would depend on the size of your hexes. I did this type of quilting with a couple of GFG that were 1" in size.

Gorgeous quilt!

Unless your blue hexies are each 4" wide, you're good. If they are wide, you could outline each of them through the center.
The rule about the 8" is the width between stitch lines, not the length of your stitch lines. Some people will even stitch only vertical quilting lines with nothing horizontal at all & it turns out beautifully. Your plan looks really nice. Hope you post a pic when it's all quilted. :)

Good idea to use a ruler to check on the spaces.

The longest part of the bluey bits is 6 1/2 inches, so I think I can get away with it!
Thank you all so much for your comments :-)

JeanneS's description is how I think of it too. My gran tied all of her quilts and the way she taught me is that if you drew an imaginary circle around each tie, that circle should touch another tie in each direction (top, bottom, left, right). Her batting had a 3" max, so when she was teaching me, she found a six-inch wide plate and that was my "tester" to make sure I was spacing things properly.

So translating that to machine quilting and your 8" quilting allowance batting...unless you can fit an 8" plate somewhere on your quilt with zero quilting touching it, you're totally good to go! :)

OH!!! Thank you for the question. I'm working on a GFG and was wondering, if I ever get there, how to quilt!!!! I have put a copy of yours in my bucket list to reference later!!

Your quilting looks adequate to me and seems appropriate to the quilt., which is very nice, by the way.

As long as you have stitching along each side of the areas outlined in green, you will be fine. The recommended quilting distance is satisfied by the green lines because they are so long and close together.