Thanks to all who posted help on the slipstream battles, I read them all and passed all of the slipstream missions with a total of 8 tries. I never would have got through them all without the advice on here.
Now FWIW, here my ideas for a couple of the tricky ones...
The one (22 I think it is) with the MPVs, follow all the other advice posted here, but don't overtake the second place car too early, bump into it if you have to, you don't want to come out of it's draft until you're well into the last third of the last corner, then you'll be able to catch up to the first place car and get in his slipstream.
The Skyline one, there's a bit of conflicting info on this, I found that as long as you catch one draft at the end of each straight and enter the corners at 170Mph+ you can catch the first car pretty easily
Hope this helps somebody
Now FWIW, here my ideas for a couple of the tricky ones...
The one (22 I think it is) with the MPVs, follow all the other advice posted here, but don't overtake the second place car too early, bump into it if you have to, you don't want to come out of it's draft until you're well into the last third of the last corner, then you'll be able to catch up to the first place car and get in his slipstream.
The Skyline one, there's a bit of conflicting info on this, I found that as long as you catch one draft at the end of each straight and enter the corners at 170Mph+ you can catch the first car pretty easily
Hope this helps somebody