So prior to my wife and I going full time RVing the first week of November 2019 I bought a full set of OEM brake pads knowing that I would need to replace them while on the road. I have found that with all of my big bike hondas, ST1100, and ST1300 that OEM pads were much better on life and overall performance. Neither of those bikes had ABS. Since I just hit 26k miles and after reading this thread I decided to take a look and change out all three sets of pads and bleed the brake system. Mine is a manual transmission.
On the front all four pads were very evenly worn and down to about to 1/4 of usable pad, I changed them out. The rear was a bit different, the pads were evenly worn but there was about 1/3 of the pad left I changed them too since they were out and I had new ones. All rotors were in good condition.
Bleeding the brakes is relatively easy I used a MotionPro Hydraulic Brake Bleeder to help with the process. It worked great. It is basically a check valve so you can bleed the brakes without sucking air and it takes up little room in the tool box. See Link.
The brakes have not been bled before on this bike so here are some observations. Brake fluid was dark brown, there was air in the line, most noticeable on the bleed of the left front caliper upper bleed valve.
Rodamons I am not sure why you are getting such poor life out of your pads, but first I would check a couple of things. These bikes have linked brakes and when the rear is applied the front left caliper will actuate. Are you by chance resting your foot on the rear brake pedal and dragging the brake unknowingly? If so this would contribute to added brake wear. Or is the rear brake not releasing fully after braking? Same result.
Most of my riding is constant movement with little stop and go in traffic. https://www.amazon.com/Motion-Pro-08-0143-Hydraulic-Bleeder/dp/B000MXW2EM/ref=asc_df_B000MXW2EM/?tag=hyprod-20&linkCode=df0&hvadid=312844081654&hvpos=&hvnetw=g&hvrand=6409945718712929358&hvpone=&hvptwo=&hvqmt=&hvdev=c&hvdvcmdl=&hvlocint=&hvlocphy=9030028&hvtargid=pla-572002473796&psc=1