Toddlers are tough, I'm there too.
Anyway, I don't like "running it out" on HLM. What I would do is set up alternate rep schemes, start with 2 and add as needed. For example:
Week 1: 3x5
Week 2: 4x3
Later add Week 3: 5x2
Repeat
This is for heavy day, your light and medium days can stay based off of your last 3x5 H workout.
This is only one of many ways to structure periodization in an HLM setup.
Lastly, at over 6 feet tall and 90 kg I would gain some weight, This is likely contributing to your issues.