Woah, Crispy... I was like 'hmm, interesting' reading your post... until you came to the conclusion to stop it all

I mean, surely if you have noticed a huge improvement in your joint pain and then you've tested your E and found you're in the 600s, that actually proves (or at the very least suggests) that getting your E up will help your symptoms? (At least some of them!!?)
It's very true that the increase may not be due to the patch, it might be that your own body has produced some - but wherever it has come from, a high level has correlated with an improvement in your symptoms?
I would really just focus on increasing according to your symptoms and not even thinking about bloods except checking very occasionally to be sure you are not going stratospheric with levels. (Like above 1000pmol.) You are not anywhere near that at 600...
Really the goal is to even out the lows so they are not too low. Because most people reckon that's what causes the symptoms. Which is why there might sometimes be higher results. For example, I asked ChatGPT if a woman can spike high with estradiol even during her period if she is peri-menopausal. Chat GPT said:
"Yes, it is possible for estradiol levels to spike during a menstrual period in a peri-menopausal woman. Perimenopause is a transitional phase where ovarian function becomes irregular but is not yet completely shut down, leading to fluctuating hormone levels. Here’s why this can happen:
1. Irregular Ovulation
• During perimenopause, the ovaries may occasionally release eggs sporadically, even outside the typical ovulation window.
• These sporadic ovulations can cause temporary surges in estradiol production, even during what might seem like the menstrual period.
2. Erratic Hormonal Feedback Loops
• The hormonal feedback system between the hypothalamus, pituitary gland, and ovaries becomes dysregulated in perimenopause.
• This can result in unexpected rises in follicle-stimulating hormone (FSH) or luteinizing hormone (LH), stimulating the ovaries to produce estradiol unpredictably.
3. Residual Follicular Activity
• Even if ovulation does not occur, small follicles in the ovaries may still produce estradiol. During perimenopause, these follicles can function erratically, leading to occasional surges in estradiol."
So I really wouldn't think too much about serum levels or adjusting dosages unless and until you are consistently and always getting too high results....