[RayGarlington]

When I put myself in seat 5's position on 4th, I get the brick and you get the Ace. I would have folded to your 'better low', which got me to thinking. Am I too weak in this situation? Anyhow, here are the sims:

dead 4s tc 3d 7c

Seat 1: [5s 6c 2s Kh 7d Ad Qs] (HI: high card Ace; LO: 7,6,5,2,A)

Seat 5: [As 5d 4c Jh Js 2h 3s] (HI: a straight, Ace to Five; LO: 5,4,3,2,A)

Hero: [Qc Qd 6d Ac 2d 5h 9h] (HI: a pair of Queens)

3rd
pokenum -mc 500000 -7s8 5s 6c 2s - as 5d 4c - qc qd 6d / 4s tc 3d 7c
7-card Stud Hi/Low 8-or-better: 500000 sampled outcomes
cards scoop HIwin HIlos HItie LOwin LOlos LOtie EV
5s 2s 6c 60791 94624 405242 134 168156 54040 939 0.290
As 4c 5d 81992 118156 381714 130 178470 43200 896 0.335
Qc Qd 6d 82764 287076 212900 24 7378 6283 97 0.375

4th (6.88 SB)
pokenum -mc 500000 -7s8 5s 6c 2s kh - as 5d 4c jh - qc qd 6d ac / 4s tc 3d 7c
7-card Stud Hi/Low 8-or-better: 500000 sampled outcomes
cards scoop HIwin HIlos HItie LOwin LOlos LOtie EV
5s 2s 6c Kh 62460 96961 403004 35 114499 28919 349 0.255
As 4c 5d Jh 62944 87027 412923 50 140830 20638 334 0.268
Ac Qc Qd 6d 147237 315959 184020 21 21620 8995 147 0.477

5th (4.94BB)
pokenum -mc 500000 -7s8 5s 6c 2s kh 7d - as 5d 4c jh js - qc qd 6d ac 2d / 4s tc 3d 7c
7-card Stud Hi/Low 8-or-better: 500000 sampled outcomes
cards scoop HIwin HIlos HItie LOwin LOlos LOtie EV
5s 2s 6c 7d Kh 46343 63736 436264 0 242792 37611 441 0.326
As Js 4c 5d Jh 57414 149505 350495 0 45334 17190 56 0.247
Ac Qc Qd 6d 2d 109086 286759 213241 0 46405 15831 449 0.426

6th (7.94BB)
pokenum -7s8 5s 6c 2s kh 7d ad - as 5d 4c jh js 2h - qc qd 6d ac 2d 5h / 4s tc 3d 7c
7-card Stud Hi/Low 8-or-better: 24360 enumerated outcomes
cards scoop HIwin HIlos HItie LOwin LOlos LOtie EV
5s 2s 6c Ad 7d Kh 878 1653 22707 0 14990 8000 1370 0.356
As Js 4c 5d Jh 2h 2436 7224 17136 0 4644 4092 196 0.246
Ac Qc Qd 6d 2d 5h 2055 15483 8877 0 3260 4302 1370 0.399