Most OEM seats suck, fact of life. I replaced both the Grammer in my cab Kubota and the vinyl butt sweater on my open station with Talon Cordura covered seats and added K&M self contained air suspension bases too.
I see alot of guys changing to marine boat seats. There actualy cheaper and sell them in alotnof different colors. Having a cab the UV/weather protection of the marine grade prob dosnt help.