I think the Jimnys enjoy the current cholistan track too much.
Looking at the results, the Jimny's have always been around 30 minutes slower than the fastest time at Jhal for last three events. Also at Mithi, they were 30+ minutes slower. Even at cholistan 2010 they were 30 minutes behind. At dharki they were 12 minutes slower, but it was reduced to single lap, so over two laps thats roughly 24 minutes.
I think since Nadir's tacoma, they have been making tracks at cholistan narrower n slower for their own advantage!
BTW I note Mehrab khan did't attend jhal or even mithi. Maybe he knows the cholistan track too well!
I think you have been looking after UZi too much, you should bully it around a bit more, better times will come automaically.