You will only do well on TRT with a limited type of protocol which is do in part to your very low SHBG which TRT will decrease even more. SHBG binds testosterone and loosely binds estrogen which means if you inject infrequently, TRT will not show good results.
Large massive injections is the type of protocol for men with high SHBG because the large doses suppress SHBG, you need to opposite, very small doses. Low SHBG men also metabolize and excrete testosterone very quickly, another reason to inject daily doses.
Another reason for daily dosing is you will only need a Total T of 400-550 to see Free T at the top of the ranges, so targeting a high normal Total T will only cause you sides do to excess T and E2. You’re at a disadvantage having lower SHBG, insulin also binds to SHBG and a low value means you’ll bind less insulin.
Low SHBG = bind less testosterone, insulin and unfortunately estrogen is loosely bound and will mostly likely cause free estrogen excess since it’s loosely bound.
Low SHBG men who inject moderate doses too far apart are expected to struggle on TRT, in general low SHBG men do struggle on TRT do to free hormone excess. You’ll be lucky if you see an increase in SHBG, I did see an increase of SHBG on TRT 14–>22, most see a decrease unless the reason for decreased SHBG is obesity and/or insulin resistance.