One does not necessarily try to aim for a total t number near or at the high end of the physiological range. Total t is important but free t is what really matters and not everyone needs to have a trough in the
900-1200 ng/dl range as symptom relief and overall well being and of course blood work with blood markers in a healthy range is what really is of utmost importance. Understand that there are many men with troughs in the 600-800 ng/dl range with a healthy free t level and of course other hormones in check especially estradiol. Sure some men feel much better having their trough numbers at or near the higher end of the physiological range
900-1200 ng/dl but is not a given. Testosterone is a powerful hormone and it is always better to start low/go slow when starting trt let alone adjusting a protocol and do not get caught up in chasing numbers as low t symptom relief/overall well being is what matters and for some that may mean mid-normal testosterone levels where as others high/normal. If you are injecting every 3.5 days as an example Monday morning/Thursday evening than you should do your injection Thursday evening and have your blood work done Monday morning before your next injection to get your trough. Also understand that injecting every 3.5 days with smaller doses of testosterone you are smoothing out your peaks/troughs and your levels will be more stable as oppose to once weekly injections with a larger dose where your peaks will be extreme following the first 24-48hrs post injection and than by the end of the week 7 days later your levels will be much lower.