Wishbone Bush Woes

[Scary1]

Any advise please. I've had to remove front wishbones to repaint (POR15 great paint), the lower bushes looked a little poor so Superflex top hat style bushes were bought and fitted, front suspension was loaded before final tightening of the bolts. Test dive was great until moderate to hard breaking, which caused a 'graunching'/ grating noise from offside only - as if somthing was moving metal to metal. Has anybody any ideas or experienced similar. By the way the metal insert of the Powerflex bushes were a very tight into the mounting lugs of the chassis