Not nearly as smart as you think you are.
That is such an interesting comment. You should do a little bit of research on the reasons why the long ranger is the way it is. It's limits for speed are only driven by drag and power. The long ranger and all jet ranger and 407 aircraft are draggy . This can be overpowered with more thrust. The 505 also reduces drag from the rotor that comes from advancing blade Mach effects at high speeds... The 505 NR is 3% slower than the L4. If you look at speed vs power curves on an L4, this 3% change would drive major improvements in speed capability.
I have sought out knowledge of the 505 flight testing and know for certain that the rotor has gone beyond 152kts TAS in a dive and has seen more than 130kts MCP in steady level. The engineers and sales folk at the shows will tell you a lot if you just ask them.
There was no flight attitude issue related to the Horizontal stabilizer... Your comment makes no sense. The old design had a much longer moment arm and would have been even better for nose down angle... Do the math. Talking to the Bell engineers directly, the stabilizer moved to increase stability in low speeds and transittions from high speed to low and vice versa.
looking forward to hearing people speak who have flown it. I met one guy who doesn't work for Bell who flew it. The guy loved it and has 2 on order and is working on a 3rd.