Thanks for the responses so far! Interestingly enough, a few days after the workout, the 10x3 muscles are not sore per se, but feel almost 'wobbly'. I believe this is due to the cumulative fatigue and the fact that 3 reps don't produce much lactic acid (hence no soreness).
Regarding X1/X2 sets, I find that some are very easy to implement, others not. For example, skullcrushers and BB curls are easy to do A1 then A2: same barbell, same area of gym etc. But, something like SLDL and shoulders are hard as they are far apart, use totally different equipment etc.
I had two more questions if you don't mind:
1. what happens when it is near impossible to add increments of 2.5%? For example, I am doing BB curls at 35kg for 4x6. The weights don't allow increments of 800g so what should I do in these cases? The lowest we have is 1kg plates, meaning a jump of 2kg total in this case.
2. I read in some places that after 6-8 weeks you can deload for a week and start over, possibly changing the exercises a bit. What would you suggest for a deload?
Thanks and Cheers,