I originally used an HD flasher and it didn't work. I have *ALL* LEDs - there just wasn't enough load to make the HD flasher function. I had to go the electronic route; something specifically for LEDs.Nice write up om.
Just an FYI when I did this mod I used a HD flasher relay from an auto parts store. They are intended to fix just such a problem, just like the one you used. However, the one that I had only had two pins on it. The install was a little simpler because all I had to do was push the two pins out and attach them to the new relay.
Here's a write up like I used.
2-pole flasher mod.