Welcome fretherne.They are great bikes.
The relay weld up is due to low voltage,which results in high current and arcing.Best touch up the contacts with some fine emery paper if it's still pulling them in.You may be hearing only the "load shedding" relay. :dunno2:
The next thing to hammer tap is the back of your starter motor.You may know,from your research,that these brushes are used to earth some of the electrics making them crushial.
I ran a shagged rear shock for similar reasons.I learnt to control the rear end using the throttle and the dive n rise from the shaft.Very bad!Puts more strain on the transmission causing the rearmost spline to "rub" and grind it's self away under full load...I got a basic YSS shock but it's not the best.