I would like to say a few things:
1. TIB550L is not out of 854. I saw it once on 854 and it has
done 853 too.
2. Only SMB177J should be perm... Did you check how often
SMB178G did 855 after going SP?
3. SMB1410D is not 927 perm... It has been sticking to 176
recently, haven't heard of it being on 927.
1 is not my edit. So do not even bother asking me.
2 : I have seen SMB178G on 855 very often. But if you do not
believe my spottings, I will convert back my edits to the original
deployments
3 : Yes it is a 176 permer.