Such a low test dosage will lead to a certain level of suppression. Also, injecting 40 mgs of such a long lasting version of
testosterone does not make sense. In such case you should just inject 200 mgs per week. However, this will lead to suppression, and you will need a PCT. If you are going to run a testosterone cycle, then you should run a proper cycle with proper dosages, and with an adequate PCT afterwards. Besides - 4 weeks on undecanoate is way too little - you will start to feel its effects only starting from week 2-3. Therefore, you would be basically benefiting from testosterone for only a couple of weeks.
It just does not make sense. By now you should try out some safer ways of increasing your testosterone levels, such as using HCGenerate ES and proviron. If that does not help, then you should consider going into TRT. Don't do half-measures, since with hormones it will only make things worse.