Replaced the Michelin Pilot Road 4s c. 11,000 miles with some Dunlop Roadsmart 3s. Read some reviews that said they'd been designed to out perform the PR4s so thought I'd give them a try. Will update how I find them.
One thing I did notice is since removing the front calipers to swap the wheel out the brakes have a bit soft again (no leaks etc). Have cable tied the lever back again to see if it improves it again.
(Some pictures of the tyres below: PR4 rear, Dunlop Rear, PR4 front, Dunlop Front)