Blind
First, I know nothing other than what the guys on this Forum have taught me (and, I'm still learning!). Next, I HATE WIRING!
Turn sigs go crazy without a good ground. That said, if it were me, I would run myself a "Popwood Ground" before going any further. If you're interested, here's How:
Note - this is assuming your bike has 2 large headlight retaining nuts inside the headlight housing and that each has a ground wire soldered to each nut (like a CB550). If this is NOT the case, none of the following will apply. (The ground wires on a CB550 are Green.)
Make sure contact with the retaining nut and bolt is clean and well grounded (not hampered by rust, paint, etc. I cleaned mine with Spray Contact Cleaner. That said, splice into one (only one) of the ground wires mentioned above. (I suggest at least a 14 gauge wire.) Run this new wire back to a coil retaining bolt (ASSUMING your coil bolts to the frame). Use a ring terminal. Remove the bolt. Clean the area where the ring terminal touches the frame to bright metal. Run the bolt through the ring terminal and reinstall the bolt.
That fixed the goofy acting turn sigs on my CB550. I hope this applies to your bike and that it will also fix your problems. If it doesn't, read my first sentence again and keep asking questions. Someone here who knows what they are doing will help you.
Good luck.