External wastegate vacuum lines

[Bbandit]

I posted a while ago about having problems with how my boost controller acted.

After hours of thinking and reading, I decided that this might caused by the way I set up the vacuum lines for my external wastegate.

I have a 38mm Tial XWG.
Right now this is how I route the vacuum lines.

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Tial XWG has 2 vacuum nipples (1 on the top, and 1 on the side).
For the top: Hotpipe vacuum nipple -> T -> B/C Solenoid -> Top nipple

For the side: T -> Side nipple

Problems: Whenever I let off the gas after boosting, the BOV vent and the WG opens.
Whenever I punched it, It build boost up to 0 psi and then the WG opens for a fraction of a second, and then It closes and build boost all the way up until my set boost.
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Solution (Please comments and give advices/inputs):

I am going to junk the T fitting (well not really, its going to be used at different line).

For the top nipple: Hotpipe nipple -> B/C solenoid -> Top nipple

For the side nipple: Brake Booster -> T -> Side nipple

This way, the side nipple will act independently instead of being interrupted by the B/C solenoid.
Plus, this will prevent the WG from opening whenever I let of the gas pedal (Since brake booster vacuum is sourced from the intake manifold after the throttle body plate).

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What do you guys think of my game plan?
Inputs please

TIA