Yeah we are taking about the same thing from two different angles, I'm talking about using a boost controler to maximise boost response without causing a spike.
Your talking about tweaking the mechanical system to prevent it from spiking and sacrificing some boost response in the process.
But you are correct if the hardware cannot be setup to mechanically prevent a spike no boost controller would help.
In essence if using andyform of adjustable boost control you'd setup the mech side so it doesn't spike then use the controller to fill in the curve up to the max it'll allow before it spikes for better responses and boost up top.
Given your turbo has been modded you may be able to build a nice curve with only tweaking preload.
Btw I tune turbo falcons with hpt and have a lot of experience with turbo conversions into non turbo fors chassis, non ford chassis and na to turbo conversions.
And I also have a history of fixing turbo conversions that some of the big name shops couldn't get right.
We should talk.