This works well enough for a first post back...

Believe it or not Nike has sports bras that go up to a reasonable size as does New Balance.

Nike Determination Women's Sports Bra hits up to an XXL, and New Balance's Tonic Crop hits an XL.

I am... What some might call "busty"... Think 40-44 G-J depending on the make. A 40GG British Standard Sizing...

I've tried a lot of different ones and I have actually figure out for me I need one that is tighter without cutting in - if you try one on and it is comfortable and a bit loose try the one size down and don't forget to do the jump test . Basically holding me in and flatter against my chest. If I am jogging then I double up with a soft, properly fitted one under a sports bra but I've had good luck for most other activity with the Nike ones specifically.

Thicker straps are better for me as well, and I try for a higher neckline so it covers them on top more.

Ha, Duct tape- It can be used for everything!!

I actually like the two bra wearing idea- it works for what I need it for without costing me more money LOL I have hand wraps for boxing that I am thinking of trying just to see which one gets better results LOL

Will have to check out the nike stuff however, does sound promising!!

Thanks for the idea. Never thought of using two sports bras either.
Will try it out and see how it works for me.