Loping Plains drops for Exalted level gear seem perfectly fine to me. I can box up alkalai loams, superb marrows, and flawless spinners pretty easily from Loping Plains mobs.

Note however that Wereorcs do not seem to ever drop TS stuff for me. No ores, no loams, no silks, no marrows, etc. so try mobs other than Wereorcs. Besides, the fewer people hunting the orcs the better the zone is for everyone in it due to the horrendous lag spikes caused by those orcs.