1:10 ratio then which appears to be starting dosage. i've used several ratios (under medical advice) ranging from 1:10 shifted to 1:12 then 1:15... amongst other ratios.
It could be worth while trying a fast for the first few hours of the day.
if you use libre check out
https://www.libreview.com/ on page2: Considerations for the Clinician¹ : there should be considerations for clinician: might be worth checking if anything is listed there then discuss with said clinician.
mealtime patterns you can ask dsn/consultant if they see any correlation to differing insulin requirements, if so could they either work out new ratios, alternatively give some extra education to allow you to work it out yourself. if they are unable to do, part of dafne course was on corrective dosages. usually given standard info based a little on averages (bmi etc) 1unit would likely decrease sugars by X. remember if doing correctional dosages has to be Y hours before correcting to prevent insulin stacking which can cause sugars to drop very quickly. You can call dsn to request a refresher or ask for advice on dosages (forum rules don't permit dosage advice directly) we can signpost.
there is a ton of things which can effect glucose levels.
dka isnt nice

lots appear to be diagnosed via dka like myself