Eight Six drift tune with good grip on straightaways and/or drift tips?

I've been investing my time building my 86 around the one Takumi uses from Initial D because I've been a big fan for a while (still haven't finished the fourth season, though) but I don't know if it's me or my car because it seems like I can't drive straight for more than 2 seconds. I'm not really an expert on cars but I'd like to know more what I'm doing one day. I'd like to know more about control after the drift because I can't seem to straighten myself after the drift.