Lot of juicy stuff here
PVE
Ward change is big and for someone like me who will do the PvE portion regardless I'm now looking at +5k in crests savings, nice, might even start a new alt cus of this
Please consider adding VW set to invader ward, the time to acquire is not different than Bloodlord and is better for main spec.
And add soulstones quests to GB and HV, or change the quest to 4 (end)boss kills from any dungeon, CT especially have people drop out halfway.
AP Changes
Having played a bit with the AP changes on an 80+ alts, I can safely say AP is even less of a concern now than pre-GCD patch.
This is largely because of the 50 extra AP pool, but also the constant AP/sec is better than previous natural AP regen.
I suggest you change it so you either start at lvl 1 with 50 AP bonus and then lose 25 AP at RR65 & RR75 or remove it altogether, most (near)BIS gear will naturally hit AP softcap, so you end up with both a regen and pool advantage.
SC changes
Increase SC base reward to 3 total war crests. Main complaint is getting stomped and SC rewarding essentially nothing.
Add 1 crests for total SC contribution, if you don't have a calculation for this already (e.g. contriubtion calculation for city/fort), I suggest the following: heal+protection+dmg+death blow*1000+objective*10+resses*100.
Hybrids and 2H tanks will often do highest dmg+heal/prot but less often be top in any.
Ranked
Fine changes, don't think it's enough and could be considered another reward nerf.
Now that you can get the ring "without proving your worth" with 10K crests, I suggest increase ring insignia cost to 200, and each solo ranked win now gives 2, draw 1.
Each group ranked win gives 4, draw 2.
To make ranked an attractive option to save 8K crests.
LOTD
Add one-way 1:1 conversions for Golden Scarabs to War Crests.
The jewelry is nice, but niche, so being able to convert one-way will bring War Crests progression to fort levels, which will encourage participation regardless of need for the jewelry.