It's not recommended to go over 0.85bar on a stock turbo.

My rb20 was pushing 275@fly with the following:
Apexi filter
Apex performance fmic
Gtr fuel pump
Ngk BKR7EIX plugs "gapped to 0.8mm"
Hks adjustable actuator "set @ 0.9bar"
Japspeed downpipe
De-cat
3" cat back exhaust
Stock afm + ecu.

I never had a problem with stock coilpacks.
I used 10w40 semi synthetic oil.
Used the car for track + road for 2years ,it never let me down.