Okay, watched it (first thing I did when I got back).
Lets discuss your quick lap:
Could save a bit of time by trail braking into T1 - that is turning in before you've come off the brakes, but only steering more as you brake less. Not the easiest of things to learn, but it's worth trying (and is useful in any car at many tracks).
On the exit you were okay - could probably use a smidgen more power on that lap, but it's a fine line between grip and slip. The main thing was that you ruined your line into the chicane, which meant you had to lift (I think you could have just got away without a lift, but then I wasn't driving
). Your line on the second lap there was better. Not lifting means you leave the chicane slightly faster, and by the end of the straight that extra speed can add up to a considerable amount - like 0.2 seconds.
Into T3 you were okay - I use 4th myself a lot of the time as it seems to control the back a bit more, although 5th is faster. Good line all the way through.
In the Esses you did well - resisting the urge to lift when you used both kerbs. I'd try to use a bit less of both kerbs - the first one has a steeper inner section that can throw the car into oversteer, whilst the second kerb (via oversteer) just scrubs of speed - can cost 0.15 seconds there alone.
Turn 6 is (imo) the hardest corner, and you took it well if a bit conservatively. I think you can take it at 90mph and you were 5mph below that iirc. Might not sound much, but the difference between a 1m10 and a 1m9 is all in the petty details. Good line though.
Last turn - very good, although I can almost hear you hold your breath through there. Little lift was perfect. If you're very brave (and a bit lucky) you can just do that turn flat I think, or at the most briefly going to 50% throttle.
Watch your lines down the back straight and the start-finish straight too. Take the shortest line in both if you can, as you'll cover SLIGHTLY less ground = quicker
As for your consistency I think it's more concentration based - you seem to forget to brake at the right moment, or do something as if you've drifted off. But thats only from watching a replay, so I apologise if you didn't think you're weren't concentrating.
My Braking points (from memory)
T1 = 100m board
T3 = start of kerb on left
T6 = 60m I think (just before 50m board)
It's not worth trying to brake later than this (well, you can go a bit deeper into T1 but I find it makes the exit even harder). Braking earlier is quicker than braking later, so if in any doubt just brake 2 or 3 m earlier.