No ... I'm sorry! I missed your sig! My mistake.
Sounds like a rough trip! Sadly, often non pro seat mods may not work ... and IMO, sheep skins are useless for LD comfort, even though Aussies and Kiwi's swear by them. Yea, Corbin is expensive ... but I can ride 10 hours on mine.
Stock seat was only good for an hour or so. Crippling!
Cheaper option would be a Seat Concepts Kit. Or find good foam and have your own built by a real seat maker in India.
A WIDE seat is key to comfort, IMO. That and high quality, firm foam that won't break down in a few months in high heat and wet.
Sounds like your DRZ has some serious issues. It shouldn't be using much oil and 60 mph should be a doodle if running well. I'm sure it's an Odd Ball Bike in India and I have NO ADVICE as to where or who you could take it to for sorting. Sorry. But I bet someone here could help!
All the guys I know who've done India have rented or bought bikes there as shipping in their own bike too costly and famous Indian bureaucracy was too much to cope with. (that I DO know!)
I've never ridden in India but visited twice for work. A nightmare.
Sounds like you need to head for the Hills and away from the motorways?
Do be careful, but by now you could probably teach a course in MC survival on
Indian roads. It's nuts there (thank gawd I never drove there!)
To stay on topic, I guess your DRZ is considered a BIG bike there? Seems the pace in some areas is slow enough that 60 mph would be risky?
Any way, good luck getting things fixed up ... and safe travels.
(PS I'm only 5'6". Do OK on DRZ400S ... one butt check hang off to one side to get foot down is the ticket. DRZ is LOW vs. real dirt bike! (like 37" seat)