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@ MH its a 3lt Turbo diesel for crying out loud, how fast do you expect to go.
They are highly strung from the factory, might be chasing your tail,
you might be better of slotting a LS1 in it, lol

Im about to change all my boost hoses to
some that have spring loaded clips on them

Yo MH what type of vacuum hose are you using, its not collapsing on you.
just throwing stuff out there, seems EFI fuel line works a treat, only 25c a mtr
Some of the fancy silicon stuff is shite

Not always thats why someone, Darren Dawes I think supplies
a heavier spring to allow more boost to be screwed in

HI MH have you tried stretching the dawes spring a tad, bare in mind its hard to "UN" stretch,
not impossible though. You can get heavier springs from somewhere to suit the dawes

Good find MH a factory tigged IC is about 33% bigger than stock, so a small gain to be had.
Have a look at an XR6 IC I think they would be very close to working .

but fitting nads you can control the boost preventing limp or over boost mode

With MR possible hose split or from running big boost split the IC open a bit more.
You can remove the IC and check in water with a bike pump, make sure its dry before you replace
it a hair dryer...