Try this. It will take a few days to get used to it but when the mirrors are adjusted this way you really have no blind spots. Sitting in your seat normally, move your head sideways until it is just touching the driver side window. Now adjust that side mirror until you can just make out the side of your vehicle in the driver's side mirror. Now move your head roughly over the center of your console and adjust the right side mirror the same way (this is not as critical because of the optics and wider view with the passenger mirror). Then return to your normal seating position. You can now see the areas to the right and left rear with a much wider coverage in the mirrors. If you look while in traffic you will see that a vehicle coming up on your driver's side will roll out of your inside mirror and into the driver's side mirror with a slight overlap. Same for the passenger side. As that vehicle comes up on you to the side it will just start to disappear from your side mirror at the same time it enters your peripheral vision, especially if you just turn your head slightly. You basically have full coverage from 3 - 9 o'clock around your car when taking your peripheral vision into account.
The only vehicles I have not been able to see 100% when adjusted this way have been motorcycles because they are just not long enough, so I just take extra care to keep an eye on them when one comes up behind me.
I will freely admit it makes it more difficult to back the car up with the outside mirrors adjusted this way, but I am willing to move my head to maintain rearward vision in the mirrors, and my old school self is getting more comfortable with the rearview camera.
