H-e-double hockey stix yeah, on the down riggers. Once you graduated to sonar, I knew it was a matter of time until you got riggers. There are so many advantages they give you.
Beav, we used to do the same thing back east in this little trout pond that held record browns.
Not only do you fight with no added weight, but, you do not have thousands of yards of line out to achieve the desired depth. And then, it is a crap shoot. With the rigger, you set a depth wher the fish are.
Also, the ability to 'dredge' bottom for lazy mid-day lakers is great when the bite turns off. Watch the sonar and keep your ball 5-8 feet off the bottom. You will see the ball on the screen, so you can move it up and down to follow the bottom contours.
I have a Cannon Mini on my boat. Don't trust the depth counter. Trust your sonar screen. Also, I recommend getting the braided downriggger rope to replace the wire. Cuts the water better and has less drag. Really helps with the light 4 lb. weight, keeping it straighter down that is.
Oh, and, let me know if you want some help manning the cranks some time. I have p-lenty of practice. (Haven't lost a cannon ball yet :dance