Your two stated labs are comparing peak and trough levels. It sounds like you are taking one 100mg dose per week?
Because your SHBG is low, you are a rapid excreter. You peak high, then the T does not stay in your system very long, hence the seemingly wild swings in level.
Typically Low SHBG guys even this out by doing small doses daily. That way you'd not be getting a large dose with such peaks and troughs.
