Hello friend, I wanted send you a PM but I think there is no problem if I write down the offsets here... maybe someone else could use them...
I have these Offsets, as you see are not just one adress...
E5E407
E5E40E
E5E3F3
E5E3FA
Take a look in those... but anyways, in my opinion is better to search for the palette offset in SNES palette Editor... there you can find all the adress for eaach BBackground you want.