Yeah but you haven't given a strong enough reason to pigeonhole Warne and Murali there. Let me give you mine:
Top tier best bowlers, near flawless records and top ratings in their era
1Marshall
2 McGrath
3 Hadlee
Mid tier best bowlers, well rounded records and top ratings in their era
4 Imran
5 Steyn
6 Ambrose
Elite spinners, well rounded records with serious weakness and top ratings in their era
7 Warne
8 Murali
Bottom tier best bowlers, record with gaps but top ratings in their era
9 Lillee
10 Wasim
11 Trueman
You can argue over what order Imran/Steyn/Ambrose should be, but what is less arguable is that they belong together in a tier with all-round impressiveness across countries and opponents, albeit not at the level of the top tier but without any significant gap or weakness.
The reason Warne and Murali go ahead of the last tier is while both sucked against India, the others had not enough output across regions like Lillee and Trueman or not quite the same overall stellar stats/output as others like Akram.
I agree with your first list, don't think there's much argument there.
I don't disagree with the names in your mid tier, but diverge on the order. I would have Steyn, Ambrose then Imran.
I understand what you're doing with the last tier, the guys who have seriously high peer and reputational rating, but reality is a bit different. Don't think any of them was better than Donald and possibly Garner, and kind of on par with Holding and Lindwall.
I guess the same way you are holding firm that Lara for you don't belong in or feel right in that top tier, I'm not sure Imran is quite there for me. Unlike you I'm no longer willing to go toe to toe and argue about it.
That doesn't mean I don't think he's amazing, I just prefer the 5 guys I have above him.
With regards to where the spinners fit in, as I said I just want sure, so when I'm not I go with the consensus, it wasn't that complicated.