Don't worry about it. You're not at the stage of development where you'll need reps of 1-3. Stick with 5 or more reps every set.
Also, and this cannot be stated enough, you MUST MUST MUST eat enough to grow. It doesn't matter what rep range you're in if you're not eating enough to put muscle on. You won't gain any muscle.
What I would do is mix and match. I've done this for years, and continue to do so. It works great. Take the first 1 or 2 exercises of every day and do sets of 5 or 6 with a heavy weight (after warm ups of course, and make the goal to get 5 x 5, or 4 x 6). Please have a spotter just in case :). Then for the rest of your training that day use 8-12 reps per set. Make sure you're doing compound movements for most of your training, especially the heavy 1st exercise.