divination is one of the lores I'd prefer to face, it's rubbish against armour and the buffs dont effect armour or wound rolls and since my EH & FO have been shelved the missiles dont bother me.It certainly has its uses and I have seen quite a few of your lists, others with and others without the scroll. Just that I never take it, I try to think some other way of dealing with unnerring strike'alikes.
Its mainly for double strength buff, double snipe, double alch blast, death is only the beginning & druidism. I pretty much only ever take it if I'm taking an adept or two though.
Your choice of scrolls is totallly legit. Top dog(s) is(are) usually shaping the meta and try to be one step ahead of others
So what ever legal method brings wins it's good.