bingo, primo is a mild anabolic. If you don't take enough, you won't see much. For example, people bridge with primo not to gain size but to 'keep' what they gained. What is a typical bridge dosage of primo? 300mg/week.
So, you did a third of what other people do when they don't want to gain at all, and you think your results were so-so.
I really don't know what to say. Yes, primo is painful, but so is throwing money away, which is what you are doing if you do primo at these dosages.
If I did primo alone, and it was not a bridge...I would think 600mg/week would be the way to go. Maybe 400mg/week if you are a beginner.
You would get better results from 250mg/test and 300mg/deca per week. Try that, and the shots aren't nearly as painful as primo.