99.9% of the time, any tuning problems you have on a hardtail guitar will be down to either the nut or pooor restringing technique, NOT the tuners. The Gotoh tuners on your guitar are prefectly fine, and are in fact very high quality.
Scrape a little graphite (pencil lead) and/or vaseline into the nut slots and make sure you know how to restring properly. I'm frequently amazed at the number of experienced, talented players I encounter who can't restring properly and don't even know it.