Thanks for the reply, now that you mention it the second turbo does feel like it comes online in closer to 5000 rpm rather than 4000 rpm. As for before the install I think it was fine, but to be honest with you I really didn't drive it much.
When I bought the car I had found that two of the wastegate vsv tampered with at some point in it's life. Both vsv were bypassed for some unknown reason, where both pipes that enter the solenoids we're joined together, ill upload some pictures showing this. During the BPU install I reconnected vsv towards the back of the engine to the original configuration and bypassed the one in front of the turbo to fit the boost controller.