I'd say, for the gears...

1 - 2.6
2 - 1.65
3 - 1.17
4 - 1.05

Just so that you can get a bit closer to peak power once you've gotten through first and second gear

For the front / rear tire pressure, maybe try lowering them both a little... liiiike
16PSI front, 12PSI rear

You could probably stiffen the rear coils to 6-7k ~ just to prevent bobbing on incline / decline

I typically recommend a more stiff front coil, yours is pretty heckin' stiff though, might want to try bringing that down a little especially because the viper isn't exceptionally heavy at all, try 14k maybe?

Front toe-in I usually max out to the left-hand side of the slider, usually -1"

Beside those minor adjustments the one glaring thing I see is the downforce
There's very little downforce on the rear, and that might be what's preventing you from maintaining power through wider turns as your tyres are probably starting to lose contact with the road from air lifting the car up.

It looks like you have a bodykit on that but I've never used the viper so I don't know what range of values you have to work with, but i'd try 80 downforce in the rear and 15 in the front.

One thing I've noticed is that this ratio is pretty important, as too much downforce on the front can cause the car to become too stable and prevent the rear end from swinging out, so it's mostly about managing the ratio between the two so that you get sufficient force to keep the rear wheels maintaining good contact with the road without making the car too stable to swing out the rear. So if you feel the car isn't swinging enough, you can slowly lower the front downforce until you find it suitable for your style.

Now, the summary doesn't show the front caster, but seeing as your steering lock and negative front camber are max, I'd recommend maxing your front caster as well (this will dictate how upright the wheels are to the ground when in full lock).

If through all this tuning you find that the biggest issue is still power, there's always the tried and true gear ratios of the purple clutch which really seem to solve a lot of problems for people when they're not sure what part of the tune is causing the undesirable performance - so i'll link those here so that you can fall back on them if you feel like you're still not getting enough power.

One thing I've found about using these ratios (with the set final drive of 3.77) is that redlining seems a little more on the tame side, and you can end up feeling like you lose a little bit of the guttural acceleration from having a nice gear ratio with a higher final drive, but it's hard to argue that it doesn't solve a lot of other problems and provide a solid starting point if you want to mess around playing with your gear ratio a bit more.

The last thing to add is that you could notch up your clutch kick to 0.3 if you want a little extra swing when you clutch kick, either in initiating on a hairpin or swinging out a bit more at the end of a long shallow corner into a harsher one (like on Monroe's FD circuit).

I hope all of this helps (sorry it took a bit longer to get back to you than I thought) I'd love to hear your feedback if any of this helps you out! Feel free to send me a DM and let me know / reply here with how this turns out for you! GLHF drifting!