It al sounds fine 2 me m8. Take 1 ov the plugs off ur injectors n check the colour. If there green its stage 3. N u can turn the boost up more if u want. Up to 2 bar. Like 28psi. As long as u ent misfirin at peak boost in 3rd its fine.
Do the boost test. Floor it in 3rd and alpy the brakes. No lnger than 5 secs tho!!! 2 increase boost wind the act rod in slitly n repet the test til ur hapy