Freebie diesel SCRoG and voodoo

I've picked up six seeds.

Diesel, blue widow, pine express, hollands hope, blackwater, vanillakush.
Considering I already grew out three and figured their strains, due to all beans being placed in the same bag, the leaves on the plant I'm growig now are considerably sativa dominant bringing me to think it is the diesel.
Anyhow advanced nutes says to use voodoo during the first week one through two using voodoo juice. So I am.
My screen is about 80 percent full and I'm flowering.
The question is, is will the voodoo(second time using it) slow the stretch if it is sativa dominant??
I'm putting her into flower and am more or less curious in advance if I need to top he out a little on the edges first.
Thanx in advance
 
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