At the end of the 4 week cycle do you measure your 1 RM's again before starting cycle 2 of OMOB?
For each new cycle, add 5 lbs to your training max (training max = 90% of your 1 rep max). 10 lbs for lower body work. Even if you think you can go more, don't. You're getting stronger. Over do it and you're smoked then sliding backwards fast.
I tested my max too frequently. Try doing a max check every 3 or 4 cycles. Rep maxes are under rated and are a great way to assess your gains. Plug your numbers into the OMOB 1RM calculator to get the estimate on your max.
If you make a 5 lb jump every cycle, that's a 60 lb increase in a year! That's remarkable and cannot be rushed. Slow and steady.