I'm not a bloodworm fan, I know a lot of folks use them but I don't. They have a exoskeleton that is hard to digest/process and could potenitally get stuck in the intestinal tracks irritating the walls allowing flagellated protazoas to take hold causing digestive problems.
Because its not just high proteins that cause bloat, it's where the proteins are derived from. Just because it's high in protien doesn't mean it will cause Bloat.
The idea of excess protein causing bloat, or any type of gastrointestinal issues in herbivores and omnivoires is completely inaccurate. Poor quality protein, as well as other hard to digest ingredients, can cause bloat, etc., but easily digestible protein will never cause any dietary issues.
