How accurate do people find libre predictions of hba1c?

I’ve been diagnosed T2 for 21years and on a stable low dose of Gliclizide for all of that time apart from a month or 2 on insulin at the beginning. Control has always been good although I have had to gradually reduce carbs as my initial tolerance of around 35-40g per meal has dropped such that 35-40g is closeer to my daily tolerance
I recently invested in 2 month supply of sensors in order to get a better picture of overall pattern of control leading up to next review in the endo clinic, where I plan to ask them to think about tests to follow up a suggestion they made that I may have monogenic rather than T2 diabetes
6 weeks in and the libre is producing pretty flat graphs and reports that my sugars heve been within the target level thatt I set (4-7.8 mmol) for 91% of the time (100% for the last 2 weeks !) with no hypos throughout. It gives a projected hba1c of 39 with overnight and mornig average BG in the 5’s and afternoon and evening average in the 6’s
I’m thinking through how to use that info at my annual review but, being of a sceptical nature, also wonder how accurate the system is.
Any thoughts / experiences?

cheers
Ive tried doing some finger prick tests alongside the libre but find the results difficult to assess - the readings are often identical but at other times can differ by up to 1.4 mmol.
Ive tried different gaps between taking readings with the libre and BG meter (0-30mins) because of the time lag between blood and interstitial fluid glucose - the longer gaps tend to bring out of synch readings closer togather but its unpredictable
I dont think the compression thing is a factor as the libre shows sugars happily pootling about in the 4’s and 5’s overnight and throughout the morning. All very puzzlung but I still think the sensors were worth the investment, but only in the short term

Well my suspiscion that sensor 3 was reading low was confirmed last night, which was its last hurrah before expiring. According to the sensor my sugars were 3,4-3.9 at 1.00am ish but meter test put them 1mmol higher. I took10g carbs on board ‘ just in case’ so I could sleep without worrying.
I was still soundlyasleep at 8am, but the Libre shows me at beng on a 2.6 at that point wheres 90 mins later meter put me at 5.7.
Just to confuse me furtherr, the new liibre sensor and my meter currently agree Im at 8.5 despite a total carb intake so far today of 11g alongside 2x Gliclazide with nothing eaten for nearly 3 hours - Its certainy messing with my head!