Definitely not, stuff on here is way to tanky compared to osrs. Noteiceably more otherwise so many people wouldn't mention it >.> I just don't understand what's wrong since your formulas look fine.
You shouldn't be calculating normal defence and magic defence the same for sure, magic defence should be:
(Defence level × Prayer × Other + 8 + Attack Style Bonus)*0.3 + (Magic level * 0.7)
