hi guram,
1. stop driving the car under load - its unsafe
2. get a new fuel pump, higher rated, either tomei, nismo, GTR pump, 044
3. upgrade your injectors
4. learn how to read AFR's and what they mean - plently of stuff on the internet
5. learn the basics of fuel injection tuning and what AFR's are safe etc
6. learn how to tune the powerFC (powerFC FAQ)
7. tune as needed