You also must consider two things.
First, that Spiro weakly blocks androgens from binding to androgen receptors so that while T may be at 35, some of it is blocked by Spiro.
Second, if this is total T and your SHBG is quite high (usually from oral estradiol), then a significant part of that T is unavailable, not active, bound to SHBG.
So levels do not tell the whole picture.
One could even go further and mention that these are levels in the blood only, that in tissues, levels may be quite different and how much is metabolized, converted, etc in tissues may depend on several factors.
I think, in the end, your best bet is to watch for how your body responds and how you feel in general. This will give you a quite accurate indication of what's going on.