Hi soap suds, I have type1 and endometriosis but am typing this with my gorgeous new baby lying on my chest following successful FET last year so please feel free to ask any questions if I can help at all.
Like you my sugars went a bit loopy during Stims and EC and I developed moderate OhSS (25 follicles on one ovary) so they wouldn't do fresh transfer. Clinic asked what hba1c was but otherwise ignored diabetes. Got sugars down before first FET but BFN. I largely put it down to stress and took up yoga & Pilates in addition to cutting hours at work, going for walks at lunch and doing caster oil packs to improve blood flow to uterus (and force me to lie down and relax, it also had the added bonus of lowering sugars). I didn't have acupuncture very often but only because the lady I saw moved away and the stress of travelling 3 hours to nearest one outweighed benefits. I have had it regularly for endo in past and agree it's very relaxing so worthwhile keeping it up if you can - great for physical and emotional health. Anyway, 3 months later the second FET worked (with the same grade of embryo as first time round).
Incidentally, I had endometriomas (endo cysts) on both ovaries at the time of EC and ET and, I suspect, deposits/adhesions too (I've had endo removed a couple of times so know when it's flaring up). my clinic were happy to ignore this as cysts were <5cm but bigger than that there's a risk of them twisting ovary or rupturing, which could lead to surgery which you obviously want to avoid when pregnant - they would show up on ultrasound at that size though.
The loopy sugars are good practice for pregnancy, it's just a case of checking checking and more checking and taking corrective action where necessary, but it sounds like your sugars are much better than mine were anyway so I don't think occasional highs prevent implantation.
Other women I've spoken to have taken various supplements (coq10, royal jelly etc) to improve egg quality so it might be worth looking into that. Low iron levels can prevent pregnancy too so might be worth getting that checked too if you haven't had bloods done for a while. Healthy diet etc goes without saying, and for OH too - I remember someone saying that hubby carries baby for first 3 months (ie before conception) so just as important for him to be on best behaviour!
All the best for your next cycle, and to kitty too. It's a mental roller coaster but it can work x