Nothing wrong with Dunlop 3s. Pinhole is most likely from nail. I had this issue recently. Mark hole with white grease pen or some other way before removing tire. Patch from inside after roughing up inside rubber. Very important - use lots of glue to seal edges of inside patch and allow several hours cure time before reinstalling tire. Good as new. You will not be able to find hole unless you carefully mark it before removing tire. Just get a new tire if it is almost worn out or over 5 years from manufacture date on sidewall.
Current "best" sport tour tire is probably Michelin Pilot Road 5 although Metzeller Roadtec 1 are excellent too. Dunlop Roadsmart 3 seems to get satisfactory ratings and is probably not a bad tire at discount.
The difference between premium sport tour tires is probably not noticeable to mere mortals without test equipment and a flooded test track.
Last edited by twowheels; 07-04-2018 at 02:31 PM.