Welcome, check out the FAQ called 1000q (1000 answered questions), it is also listed in the stickied post at the top.
To answer your questions, if you already have a chip, a boost controller would help marginally since you have a conventional wastegate style turbo and a electronic solenoid type controller would help keep the wastegate shut until the desired pressure. A spring type manual controller won't be as helpful so I wouldn't spend the money on it. In short, just leave it as is since you say you already have a chip.