yes, that is true, but 450 resilience is still quite low. You'll probably still receive 6.4k+ Chimera Crits from a 1400 resilience hunter while you're in defensive stance. Crit is obsolete for12 seconds if Roar of Sacrifice is up.
I have my prot warrior also, with full best in slot, with the stats you've given, except with slightly less resilience (420 or so).
Fully debuffed with Sunder Armors and Battle stance, the highest slam i could do on 1400 resilience Hunter was 6.4k, Shockwave was pretty decent at around 4k non crits to 6k with full procs. Revenge did slightly more than shockwave but nothing over 7k.
On a 1000 resilience Hunter I scored a 7.7k Shield slam (with block of course), Shockwave at 7k, revenge at 7k.
The Hunter still crits over 6.4k Chimeras (unless you wall).
I don't deny that the difference in damage is small, but the resilience that you have is still not enough to tank Hunter burst without blowing some cooldowns.
I was talking more about 900+ resilience prot warriors anyway, and I'm sure you can agree that they do significantly less damage because they don't have that 80%+ ArP.