This one is just plain hard. Part of the reason is that the split divides traffic quite a bit, and it always seems random. I must have had a score of 99 about 6 times before finally getting 125 (I think that's what it was). I wound up sticking with the Qirex Fighter. The key here is wait for narrow spots to strategically land plasma bolts.

•I typically got at least one fired off right away before the split which almost always makes contact.

•After the ships break up a little bit, I went left, and the back right underground because of the narrow tunnel there. Also, you'll have a great line up for that next turn on the exit just before the first open air part of the track. Any ship that took the other route that lap will be passing by as you exit, so this is a great place to use a plasma as well.

•Having done this enough, I'm fairly positive the routes are pretty random, I think that adhoc might have just had a lucky streak. In my experience, there seemed to be no correlation whatsoever, so I just chose a route and stuck with it. If you can, try to force pilots over into your route on splits. Act as a barrier and nudge them over.

•I always went left (in the tunnel) as opposed to the open air route. That straight makes is hard to successfully use Plasmas there because of all the speed pads and the wide track. If you use the tunnels, it fusterclucks the ships up enough to deal some damage.

•I'm sure you are doing this already, but I always bomb the route I didn't take for each split if I had a defensive weapon near by.