Aston back even without power buff?

Electronics:
TC1 on 4 and TC2 on 4 feels best for me as the car allows you to actually work with the rear on throttle - very rare in this game and simply nice to drive.

Adjustments (you dont actually need any imo)

• reduce front bump stop range if braking into corners is an issue, or stiffen front spring.
• move BB forward if too loose into the corners, more front ARB could also help here
• The car most likely still takes more rake if you can handle it
• race setup might be able to run more toe still

Driving

• Basically all turns need careful trailing, but you can still push the higher speed corners - the car tolerates a lot of yaw
• actually dont slam the throttle here. Often you want to go to 80-90% power, wait until the car settles, then floor it
• bumps are tough on the car, raise ride height if unbearable (2mm rear for every 1mm front)
• aim for late apex in hairpins, try to trail deep, immediate throttle [management], no coasting.
• the inside kerbs in the last corner helps rotate if you hit them just right. Throw the car a bit into last long right. 
• shifting at 7000-7100 rpm, don't max out revs

LFM:
Just reduce fuel load to 45/49L. Balance should become even more neutral. Adjust rear ride height in +-1mm to your liking (higher for oversteer, lower for more neutral behavior).