If you want strength i would recommend the following:
1.don't do vjb plyometrics(running is plyometric and u are pretty much plyometric,i saw your vid and you are springy...actually i'm impressed if u cannot squat ur weight but jump 30' so strength is your weekness)
2.do 2 strength workout /week (but try to do it when your legs don't fell tired )
Squat like this:1 set should have 3 max reps...in such way that u shouldn't be able to do the 4th.Now usually you should do 10 sets of 3 reps but stop it when u feel really sore).Rest between sets 3-4 mins.Warm up very well.

Workout 1:squat and calf raises
Workout 2:deadlifts and hamstrings curl

You could workout calves,deadlifts and hamstrings curl in the manner it's written in VJB.Try to incorporate abs in your workouts.

Another tips:do not touch with your heel the ground especially when u land after a jump.
If you want supplementing creatine is not enough especially if u want strength.U should take proteins too.