Your best pressure doesn't necessarily have to come from the weak side. If they put Leiataua at the strong side he'll still offer the best pass rush. Someone else neffs to step up on the other side but it doesn't have to be incredible. Utah had success playing an undersized LB there because the other 3 spots were so strong. BYU will at least be solid at those 3 spots, which will in turn help thr weak side end.
Getting back to a 40 front will help Uriah with the QB pressure and should free up Fauatea to have 1 on 1 inside while Tonga takes doubles. Solid interior always helps your ends.
Then they can keep pressure off of the ends by changing it up with some LB and safety pressure. They have the talent and experience now to play more aggressive overall. Trust your experienced secondary and get aggressive up front. Get creative with Wilgar off the line on occasion.