It sounds like you don't need a wide board and the 153 should fit fine.
For boots, it's best to go try a bunch on. But if you have to buy online measure your foot without socks. Press your foot against the wall and mark where your toes extend to. Now measure that distance. Also, 10cm width, seems pretty wide if the length is 27. If you are indeed 10cm, you'll probably need a boot that is wider. 32 Lashed and Nike Kaijus I know are wider boots.
Don't size up your boots to get more width. Look for a boot that is wider. Good luck.