This afternoon I tried some shims but it wasn't working, it seems the mast is a bit fat.
Then I got the brilliant idea to bend the boom arms down so the clamp could sit straight, well it bent nicely but then I tried to bend it a bit more and it snapped.

So I'm looking for a new boom now.
I have to plan it to fit with my future lightwind gear. Looks like the biggest 9.5M Ezzy sails take a 250 boom and their 6.5M takes a 198, that would probably be my range of sails so a 200 to 250 boom should work.
Maui Sails aluminum 200-250 for US$240
Aeron Carbon 200-250 on sale for US$610
Do I really need to go carbon?
I appreciate everyone's opinions