Ready to eject

Just over six weeks ago I started using the Medtronic Hybrid Closed Loop pump. For the first few days it was good but I’m getting ready, now, to place it in the ejection seat.
Despite radically reduced carb ratios, from ten to five, active insulin time, the recommended two, and giving a Fiasp bolus up to an hour to take effect, I’m spiking drastically. Breakfast this morning took me from seven point five to fifteen point four two hours later.
Any suggestions?
It’s in Smart Guard.
I’ve read that it can take two months to ‘learn’ the user: should I just hang in there a bit longer?
I’ve been in touch with the DSN and we’re a little stumped. I’m hoping someone will give me a clue.

Thanks Nicola. Do you mean you’d lowered the carb for each unit?
If that’s so, I’ll try raising my ratios. I was lowering them as I thought I needed more insulin for a meal that caused a spike.

I’ll see what happens when I raise the carb part.
I was thinking like I did with MDI but am learning how different a pump is