Temp spikes near max under hard acceleration right after coolant flush (2023 Integra 1.5T)

Hey guys, my 2023 Acura Integra (Base / 1.5T) never had any heat issues the temp gauge stayed rock-solid at 4 bars no matter how hard I drove it.
Right after doing routine cooling system maintenance and a coolant flush, the temp gauge spikes up to 7 bars (just below max) whenever I floor it/do a hard pull. It then slowly drops back down to 5 bars.
Since this started immediately after the coolant change