The best stats for DRG are in fact DH and Crit, Skill speed should be extremely low @ around 2.44 GCD. But secondary stats are pretty weak and the best stats vs the worse would still only be a small dps difference.

Your rotation very well may be solid but perhaps it's your uptime that isn't good, dropping BOTD or LOTD, or if you die even once it will put you below 4k.