Increased Post-Meal Spikes

Just over the last couple of days I've noticed a lot higher spike post-meal...I haven't changed my intake of carbs for any meal and had actually been experimenting with pre-bolusing to bring the spikes down!!...whereas before I was peaking at 8-9, over the past couple of days I'm going up to 11-12!!!!...
I'm still going back down to good figures (in the 5s) afterwards so it doesn't seem like I need to take more insulin...

Bit confused and its ruining my time in target figures so would be grateful for any hints/tips!

FYI, my carb intake is around 160g/day...

Thanks in advance!

Meant to mention: I also steer away from higher GI foods...

That's a thought...yes, it's with the Libre...I'll check after lunch if it goes high again - thanks

Maximum reading after lunch: 7.9...

Perhaps my post shamed my BSs into behaving