Avatar Perpet. Cost: Caller's Doublet vs. Summoner's Doublet vs Caller's Bracers +1

[Laume]

I did a quick search on the forums here and didn't find any articles pertaining to this so I thought I'd make a post.

The other day, I got a summoner's doublet because it was easier than a caller's doublet +1. With my current gear (and no avatar's favor), I'm somehow gaining 1 mp/tick. (My avatar perpet. gear is: evoker's ring, caller's pigaches +1, caller's pendant, caller's bracers +1 and summoner's doublet. And I have a caller's horn +1 for refresh.)
Mathematically, since caller's bracer's perpet cost is applied after all the perpet. cost - are calculated, I should have a net loss of 1 mp/tick:
base avatar perpet cost:
15
(15-1(evoker's ring)-2(caller's pigache's +1)-1(caller's pendant +weather from /sch) -3(summoner's doublet))*.5(caller's bracers +1) = 4 mp/tick
4 mp/tick -2 (auto refresh trait) -1 (caller's horn +1) = 1mp/tick

instead, I get:
[(15 -1(evoke. ring) -2(call. pigaches +1) -1(call. pendant))*.5(call. bracers)] -3(smn. doublet) = 2 mp/tick
2 mp/tick -2 (auto refresh trait) -1 (call. horn +1) = -1 mp/tick (gain of)

I'd like to confirm if that, what I'm seeing is correct, can be confirmed by another person. But also, if someone has the summoner's doublet +1 or +2, as well as the caller's bracers +1/2, if they can confirm that the HQ versions also apply the - to perpet cost after the caller's bracers.

Thanks in advance.

*note: Yes, I do realize that the caller's doublet +1/2 is better in other ways and I shouldn't always prefer avatar perpet. cost over summoning skills or other things. This thread is simply to confirm what seems to not have been documented in that Caller's bracers +1/2's perpet. cost ISN'T ALWAYS applied at the very end as we're lead to believe/documented previously.*