I would increase the weight for each week not each set for my 5x5. Wrong or right?
Here are your options as I see it, but I think its an interesting question:
1. your first set is 100% effort. In this case you will probably lose some strength each set, your your reps might look more like 5,4,3,2,1
2. Your first set is 100% effort, but you take really long rests (5 min +) so that you can try to hit 5 for all 5 sets.
3. Your first set is 100% effort, and you drop weight for each of the following sets to allow you to get the 5 reps for all 5 sets.
4. Your first set is less than max effort, maybe 80%, and you add a little weight each time so only your last set or 2 are at max effort.
5. Your first set is maybe 90% effort for 5. You keep the same weight so your second set is closer to 100%. the third set you only get 3 or 4 etc.
All those strategies can work, depending on what your goal is. I have done a lot of the number 2 type, which is more geared for powerlifting. Now I'm on more of a number 4.