I think this is one of those instances where RAW isn't as useful as a quick judgement call.
Personally, I'd nix the "Goliath = large for the purposes of unarmed strike, but allow everything else. However, since the benefit provided by the Fanged Ring is effectively the same as that provided by INA, I'd rule that they were overlapping bonuses that didn't stack (much like Keen and Imp Crit don't stack). That'd leave the PC with 3d6 worth of damage per successful strike (which 'taint half-bad).
As for allowing two-weapon with fluirry of blows, I think that its a sub-optimal choice for the PC - +9/+9/+9/+4 should be good enough. +7/+7/+7/+7/+2 is really more like "flurry of misses" waiting to happen.
Personally, I'd nix the "Goliath = large for the purposes of unarmed strike, but allow everything else. However, since the benefit provided by the Fanged Ring is effectively the same as that provided by INA, I'd rule that they were overlapping bonuses that didn't stack (much like Keen and Imp Crit don't stack). That'd leave the PC with 3d6 worth of damage per successful strike (which 'taint half-bad).
As for allowing two-weapon with fluirry of blows, I think that its a sub-optimal choice for the PC - +9/+9/+9/+4 should be good enough. +7/+7/+7/+7/+2 is really more like "flurry of misses" waiting to happen.