Vacuum question, Tial BOV fluttering Options

[CELL_PROTOTYPE_X]

Can I pull vacuum from the throttle body for my blow off valve? I see two lines going to my charcoal canister, but am not sure if I can use those or not.

The issue I'm having is that the tial valve just isn't opening fast enough, and I'm getting flutter every time I shift. I'm thinking the issue is the length of the run, and the fact that I'm tapping that source in two spots for my boost gauge and boost controller. I purchased the bov spring based on idle vacuum as suggested, but am thinking about getting a lighter spring to compensate for the poor vacuum source. Any suggestions are appreciated. THANKS!

[CELL_PROTOTYPE_X]

Thanks for the response. I'm actually using a source right off the intake manifold(the picture shows how my line is run). I was just wondering if there was anything closer to the bov that I could tap into just to make the line shorter, and hopefully in doing so, make the valve more responsive. I'll probably try a lighter spring, and see if that fixes the issue.