Wiper adjustment keeps shifting

[Jonno]

I painted the wipers on my BF XR6 Turbo and fitted Bosch Aerotwin blades.

 

Since then both wipers sometimes change their set position. So sometimes when on high speed, the drivers side wiper will bang against the windscreen pillar and sometimes it won't.

 

This is driving me crazy. I have adjusted them many times.

 

Does anyone know whats going on?

[k31th]

try factory ones again to see if it continues to happen?

[Jonno]

I have the factory arms but Bosch Blades.

[k31th]

yes, but you painted them... i'm just suggesting that to rule out the paint and blades... my guess is the paint got into the motor or whatever the wiper motor uses as a "stop".

[Jonno]

I painted them off the car. No paint got in the splines. 

[k31th]

did you have any trouble fitting them back? no force used to get the clips back on etc?

[Jonno]

No. You place the splines on the wiper arm in place, and then use the nut to tighten them down.

[k31th]

I've got no idea what you've done, then.