Dosages aren't allowed, so I can't share those, (and I'm sure your post will probably be edited by a mod to take them out in short order,)
But I can tell you, yes, it is very common for Spiro to take a LONG time to drop one's T levels. My friend Anne, who has a doctor who is very conservative with dosages, started her on what it widely regarded as a minimum dosage of both Spiro and E, and after about 6 months her levels were somewhere around 250 for T, and 100 for E. Another 6 months later, her T was down around 150, E was still just above 100.
Some friends, their T didn't get down into what would be considered the "normal female" range of <95 until they'd been on hormones for almost 2-3 years even on high doses of Spiro. Some won't get there until after orchiectomy. It just depends on each individual person and how resilient their T production factory is.
The reason why I'm sharing my friends' results is because my T factory pretty much quit as soon as any anti-androgens were added, dropping all the way down to the basement of the female range, 22 pg/dl, only 3 months after starting hormones. I was on Androcur at the time, a much more potent anti-androgen, but even after switching to Spiro at the minimum dosage that can be prescribed, my T level only rebounded to 48pg/dl at my 6-month blood test, before crashing back down to 28 at my 1.5-year follow-up. E levels, mine were immediately sky-high... 450 at my first blood test, up to 950 at my 2nd blood test, and back down to 650 as of last summer.
Here's the thing, though... levels don't really mean much. Results speak for everything. Anne, despite having really guyish levels of hormones for the entire first 6 months of transition, still ended up with full breast development, full skin softening, while even with my levels both being completely in the female range for 2 years, I've still barely developed boobs and am still waiting for the same super-soft skin that some of my friends have.