You keep forgetting I, too come from that server. Let's do a comparison:
With no sp bonus, rejuvenation ticks for 29, for a total of 116 healing.
After nerf, my rejuvenation ticks for 50 - at 87 spellpower (total is 200, so coeff is (200-116)/87, ~0,965.
Before the change, it was 66 (total value healed - 264, (264-116)/87, ~1,7
On that server, rejuvenation ticked for 76 with my sp being 120. (304-116)/120, 1,5666.
If that server was well-scripted, and warmane is well-scripted (in this case, don't bring up fiery proc against sunder please), where does this difference (1,57 compared to 0,97) come from?