[400TT]

You will also need to see how suitable 1st gear is, i.e. whether it is too low. Also whether 2nd gear is suitable for low speed corners etc etc.

Then as you mentioned above, is overdrive(5th or 6th) suitable for cruising, can you get into it at suitable speed and not be running too many revs at cruising speeds. You also find there is always a sweet spot for cruising revs where the engine/exhaust is quietest.

For track use, then correct gearing makes a huge difference, different tracks favour different gearing both for corners and top speed down the straights.

Like most things, it's all a compromise and personal preference comes into it as well. So it might be something you need to road/track test yourself first.