When I started rallying I used a 3.9:1 - similar sprints, single venue and I found I just couldn't get the car to flow properly, when I went to a 4.44 the car was so much nicer to drive, and I still probably got the same top speed when using a 3.9 In the long sections.

I bet your getting prob 100+ in 3rd gear, mine tops at around 140 - and even that is too high, but I have a high ratio 5th gear.