Keep in mind, the numbers catch up to you quickly. It'll be a different story once you get to cycle 5 or around there.
It isn't a bad thing that you are hitting 12 reps now especially if you are planning on using it for a year or more. A 10lb jump from cycle 1 to 2 isn't entirely a bad idea (which is exactly what I did the first time) but I only planned to be on it for 6 months before I dislocated my elbow (completely unrelated matter) and got through 4.5 cycles before it happened. So I wanted to speed things up a bit.
Give you an example of mine. Before the injury I was hitting 11 reps with 396 lbs (180kg). But could only manage 5 reps with 440 (200kg). The difference in projected 1RM and my true 1RM was that the projected one was about 45lbs higher.
Don't make jumps that are too great!