I don't think you can do it with the HIIT if you're actually doing HIIT right.
3 days of HIIT should wipe out your CNS unless it's very short in which case it wouldn't be worth it anyway.
And once the weights start getting high on linear progression you shouldn't need the stimulus of HIIT to grow anyway as you're increasing the weight each session.
For any set program my opinion is always do the program RX'ed. It's already fairly optimized for mass and strength gain so modifying it like you know how to program better than Rip is not a very good idea.