Optimal arcane cycles:
000000000010: 8066.7 dps, 188.2388 mps = ABSpam4MBAM
000000001010: 8015.443 dps, 150.9306 mps = ABSpam24MBAM
000000001110: 7974.454 dps, 131.7854 mps = ABSpam234MBAM
000001001110: 7672.111 dps, 59.78621 mps = AB4AM234MBAM
000010001110: 7353.106 dps, 22.29167 mps = AB3AM23MBAM
000100001010: 6856.622 dps, -17.98341 mps = AB2AM
Wand: 471.9249 dps, -234.4721 mps
Since in this case the ABar was not used anyway I've explored another model where ABar is not an option at all, but instead allow spell selection to depend on exact 2T10 duration left. The optimal cycles were the same which confirms that one shouldn't concern themselves with the exact timing to achieve optimal play.
So optimal cycles remain the same, with the exception that AB spam is no longer optimal. The values for AB spam for comparison are 7882.308 Dps, 696.4657 Mps.