Very slow at the end (>=1.30)

[iRuser]

I just got two new GTX980's today and running my old 580ti via 1x to 16x riser. PLaying around with hashcat and came across an issue relating to this post, let me know if i should put elsewhere. I get the theory on why things slow down at as we reduce the workload, but out of the three cards to choose from cudaHashcat v1.31 keeps seemingly choosing to finish the last leg on the weakest card of the 3 making it painfully slow. Why? Is there any way I can change this or can you consider making a small tweak to the logic in a future update?

Code:

$ ./cudaHashcat64.bin -m 2811 -a 0 nothing2seehere.hashes cracked_pass.txt -r ../customRules/1.rule -o nothing2seehere.cracked --remove --gpu-async --gpu-accel=80 --gpu-loops=1024 cudaHashcat v1.31 starting... Device #1: GeForce GTX 980, 4095MB, 1367Mhz, 16MCU Device #1: WARNING! Kernel exec timeout is not disabled, it might cause you errors of code 702 Device #2: GeForce GTX 980, 4095MB, 1367Mhz, 16MCU Device #3: GeForce GTX 560 Ti, 1023MB, 1700Mhz, 8MCU Hashes: 251762 hashes; 251762 unique digests, 251730 unique salts Bitmaps: 21 bits, 2097152 entries, 0x001fffff mask, 8388608 bytes Rules: 181 Applicable Optimizers: * Zero-Byte * Precompute-Init * Early-Skip * Not-Iterated Watchdog: Temperature abort trigger set to 90c Watchdog: Temperature retain trigger set to 80c Device #1: Kernel ./kernels/4318/m02810_a0.sm_52.64.ptx Device #1: Kernel ./kernels/4318/bzero.64.ptx Device #2: Kernel ./kernels/4318/m02810_a0.sm_52.64.ptx Device #2: Kernel ./kernels/4318/bzero.64.ptx Device #3: Kernel ./kernels/4318/m02810_a0.sm_21.64.ptx Device #3: Kernel ./kernels/4318/bzero.64.ptx Cache-hit dictionary stats cracked_pass.txt: 1142036 bytes, 126254 words, 22851974 keyspace INFO: approaching final keyspace, workload adjusted [s]tatus [p]ause [r]esume [b]ypass [q]uit => s Hashes: 251762 hashes; 251762 unique digests, 251730 unique salts Bitmaps: 21 bits, 2097152 entries, 0x001fffff mask, 8388608 bytes Rules: 181 Applicable Optimizers: * Zero-Byte * Precompute-Init * Early-Skip * Not-Iterated Watchdog: Temperature abort trigger set to 90c Watchdog: Temperature retain trigger set to 80c Device #1: Kernel ./kernels/4318/m02810_a0.sm_52.64.ptx Device #1: Kernel ./kernels/4318/bzero.64.ptx Device #2: Kernel ./kernels/4318/m02810_a0.sm_52.64.ptx Device #2: Kernel ./kernels/4318/bzero.64.ptx Device #3: Kernel ./kernels/4318/m02810_a0.sm_21.64.ptx Device #3: Kernel ./kernels/4318/bzero.64.ptx Cache-hit dictionary stats acne_cracked_pass.txt: 1142036 bytes, 126254 words, 22851974 keyspace INFO: approaching final keyspace, workload adjusted [s]tatus [p]ause [r]esume [b]ypass [q]uit => s Session.Name...: cudaHashcat Status.........: Running Rules.Type.....: File (../customRules/1.rule) Input.Mode.....: File (cracked_pass.txt) Hash.Target....: File (nothing2seehere.hashes) Hash.Type......: IPB2+, MyBB1.2+ Time.Started...: Sat Dec 27 18:50:36 2014 (2 mins, 30 secs) Time.Estimated.: Sat Dec 27 19:37:54 2014 (44 mins, 44 secs) Speed.GPU.#1...: 3758 H/s Speed.GPU.#2...: 3645 H/s Speed.GPU.#3...: 626 H/s Speed.GPU.#*...: 8029 H/s Recovered......: 0/251762 (0.00%) Digests, 0/251730 (0.00%) Salts Progress.......: 305965296000/5752527415020 (5.32%) Skipped........: 0/305965296000 (0.00%) Rejected.......: 0/305965296000 (0.00%) HWMon.GPU.#1...: -1% Util, 67c Temp, 40% Fan HWMon.GPU.#2...: -1% Util, 69c Temp, 17% Fan HWMon.GPU.#3...: -1% Util, 70c Temp, 18% Fan [s]tatus [p]ause [r]esume [b]ypass [q]uit => s Session.Name...: cudaHashcat Status.........: Running Rules.Type.....: File (../customRules/1.rule) Input.Mode.....: File (cracked_pass.txt) Hash.Target....: File (nothing2seehere.hashes) Hash.Type......: IPB2+, MyBB1.2+ Time.Started...: Sat Dec 27 18:50:36 2014 (59 mins, 50 secs) Time.Estimated.: Sat Dec 27 19:57:13 2014 (6 mins, 43 secs) Speed.GPU.#1...: 0 H/s Speed.GPU.#2...: 0 H/s Speed.GPU.#3...: 628 H/s Speed.GPU.#*...: 628 H/s Recovered......: 806/251762 (0.32%) Digests, 806/251730 (0.32%) Salts Progress.......: 5171375800620/5752527415020 (89.90%) Skipped........: 4331820510/5171375800620 (0.08%) Rejected.......: 0/5171375800620 (0.00%) HWMon.GPU.#1...: -1% Util, 73c Temp, 44% Fan HWMon.GPU.#2...: -1% Util, 46c Temp, 0% Fan HWMon.GPU.#3...: -1% Util, 51c Temp, 0% Fan