Who told you that you are a size 11?
It appears that you have been guessing your size and haven't made the effort to go to an Altberg retailer as I previously advised to get measured properly. Unfortunately it's a a very costly mistake made by many people.
Pull the insoles out of the boots and stand on them with your foot as far back in the heel cup as you can. You
must have about 15mm or a finger's width of empty space in front of the end of your big toe - this space is required to stop the toe bang you are experiencing. If you haven't got this space you will end up badly bruising your toe (very painful) and could easily end up losing the nail. It is not uncommon to have one foot longer than the other.
This video will show you how to measure the length of your feet but what it can't do is measure the width or the volume
https://www.youtube.com/watch?v=qYivcWR4hVkNobody including Altberg or Hanwag can advise you what size you require unless you go and get properly measured and it is not uncommon for some people to have to go up a half or full size on the measured size to achieve a comfortable fit. It's obviously preferable to try the boots on but getting properly measured is the one thing you must do.