@Lucielu The issue all the way through this is that in order to get a quick fix you are constantly changing things. Unfortunately this leads to incomplete data and often irreconcilable results. To fix a problem like this you have to take a systematic approach.
Accept that you are going to be high for the next week, then over the next 4 days do proper basal testing, systematically, according to the
www.mysugr.com/basal-rate-testing/ instructions.
Then when you've identified whether that's your issue, start to look at fixing it. An increase or decrease here or there. If that doesn't work with regard to Basal, then you need to look at what else is going on and whether you need an alternative strategy for Basal, i.e. a different insulin or a pump.
If your basal works out okay, then start to test ratios, eating boringly, the same thing at the same time on consecutive days and adjusting bolus amounts to see what works.
It's dull, it's long and it's a pain, but it's also the only way to really get around to a result, as you are isolating individual elements one at a time. That's the downside of T1. Treatment is really a complex set of interactions, so unless you simplify it down and identify each piece a step at a time, identifying what isn't working is really hard.