Concentrate on your corner exit speed. There are several places, most
notably your line through the tight right-hander before the hairpin, where
your entry line severely compromises your exit speed.
At Mexico there are several 'combination' corners. You need to treat the
pair (or sequence) of corners as one unit, and be prepared to compromise
your line through the first corner to give you a better exit from the last,
and therefore maintain a higher average speed down the following straight.
In the case of the S just before the hairpin, hug the left side as you exit
the first, sweeping left-hander, and turn in to a late apex for the tight
right-hander. You should be able to accelerate through the second corner and
carry more speed up the straight to the hairpin.
This also applies to the long series of esses, and you may find it helpful
to study an 'alien' lap to see the line they take. You may not be able to
match their speed, but you can use their line to good effect.
Remember the most important corners are the ones leading onto a straight.
As far as your setup is concerned it's definitely an alien setup ;-)
Change the diff from 60/45/3 (way too stiff imo) to 60/45/1 (reduce the
clutches) and give it another go. You should find that you can plant the gas
a little more easily out of the corners. If you find that the back end now
wants to step out too much when you lift off the gas, try 60/30/1. If it
doesn't step out enough, try 60/60/1 or even 60/85/1 (I use this).
Finally, disable the low-speed steering help and try to get used to a
quicker steering ratio. Yours is currently set to 14:1. You need at least
12:1 to make it round the hairpin without the steering aid. I use 10:1. With
the looser diff this should be easier to control, so get the diff right
first.
Malc.