Don't worry about hit/exp cap as a bear until you can do 7.5% hit and 15% exp... 7.5 exp is not worth aiming for as a goal.
As for this fight, I open with hotw (int pot and sp weapons) while the monk tanks, to allow 8 people (3 healing but a smite priest) to burst over 100k dps for the hero opener. Then I growl/weapon swap (saves on gcds as while you weapon swap you can hit growl and get into bear form) and build up rage so when im tanking, i have full rage. Then it's a case of maintaining maximum uptime on SD, popping SI about 8 seconds before I go in. I really dont get hit much doing this on the fight.
Stone guard is bad for bears as our mastery is worthless versus the bleed, but on all other fights bears rule (elegon, for example, FR is buffed 50% so I tend to FR over SD on that fight) at mitigation.
Finally... consider this as progression for how much hit/exp you can support:
1) No hit/exp - just take whatever your gear lets you have while focusing on reforging to crit.
2) 6% hit/12% exp - this is the cap for 92 mobs, some of which appear with boss fights. Note you dont go for 7.5% hit because it's not worth capping hit without hard capping exp for almost everything.
3) 7.5% hit/15% exp - this is the final goal and may require t15 and beyond to reach. This will be awesome as it will certainly maximise your awesome bear dps.