When I first started with Jason Ferruggia's Muscle Gaining Secrets programme, the very first training template comprised of just the three basic lifts: squat, benchpress, and deadlift. I was to start with 3x5, then 4x5, then 5x5, all the way to 8x5 and only then increase the weight. By the time I hit 8x5 I'm already psyched and my body is more than ready to lift more weight.
This is what was lacking in the 5x5 programme. I didn't feel so confident to increase the weights. I still felt I was too weak. It's like my body didn't have sufficient time to get ready for heavier stuff.
So I changed things up a bit, in a sense that I 'wave' my work sets. My total work set is still 5, but the weight varies with each set. But instead of sticking to 5 reps per set (hence 5x5) I now increase the number of reps for the earlier, lighter sets.
I discover that my body adapts to the later, heavier sets much better and I'm able to increase the weights I lift faster. I'm only 3 training sessions into this 'modified 5x5' and so far the results are pretty promising. Let's see how far I can take this until my body tells me to deload.