I think that is NOT normal. It sounds to me like you have a slight leak in one of your boost pumps somewhere, or a weak boost pump. I'd check all the boost pump lines, and look under the rear floor around the fuel tank, ejectors, etc. And I'd definitely pursue Bell to find an answer. It doesn't sound like it could be your main fuel pump, because it doesn't produce enough pressure above 6,000' to keep it above the redline.
When you do your boost pump checks, does one seem stronger than the other? Can you find a place to land at 9000' and perform a boost pump check to see if one of your pumps allows the fuel pressure to fall below redline? My guess is that one of your pumps is doing most of the work, or you have a slight air leak somewhere.