Thanks. Still could use results from any recent GPU(Vega 56/64, Radeon VII, etc) Think there's a pretty big speedup possible for the VII - maybe.

Radeon_5500XT
75bits 9% speedup
76bits 8% speedup
77bits 7% speedup

Can you also try with
-d 0
-d 10
-d 11

test with wrapper app, change the job....xml to job.xml and start the wrapper.

<app_config>
<app>
<name>GPU72</name>
<max_concurrent>1</max_concurrent>
</app>
<app_version>
<app_name>GPU72</app_name>
<plan_class>opencl_ati_101</plan_class>
<cmdline>-d 1</cmdline>
</app_version>
</app_config>

Nvidia on Linux

<message>
process exited with code 195 (0xc3, -61)</message>
<stderr_txt>
22:54:06 (28652): wrapper (7.2.26012): starting
22:54:06 (28652): wrapper: running ./mfaktc.exe ( --device 0)
./mfaktc.exe: error while loading shared libraries: libcudart.so.10.1: cannot open shared object file: No such file or directory
22:54:07 (28652): ./mfaktc.exe exited; CPU time 0.001267
22:54:07 (28652): app exit status: 0x7f00
22:54:07 (28652): called boinc_finish
</stderr_txt>

This code tries running an .exe on Linux! Can be done under WINE (emulator), but not native.

If you are able to copy the linux app zip folder to your linux OS and run
./mfaktc.exe -h

for helping to track down the missing app problem.