May want to consider accurate fT test if you try this to deconvolute SHBG effect from suppression/hCG effect. Decent dosing of oxandrolone may crush SHBG (and hence TT) then you would think hCG isn't working (when compared to baseline).
Goes back to TRT +/- oxandrolone. If you run fT by ED before and after adding the oxandrolone the fT should stay the same (assuming same trough measurement, etc). Hence oxandrolone decreasing SHBG doesn't free up more T, it just decreases bound T via dropped SHBG.
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@Cataceous great posts on TT/fT/SHBG/fT elimination rate.