225/45 is still 10.1cm sidewall so still reasonably comfortable. Once you start to drop below 10cm then will feel a bit stiff, and below 9.5cm then will feel quite harsh.

Switching to normal ones will surely give you noticeable improvement in comfort. Btw how come you change tires so fast?? I thought not so long ago you asked and changed already, no?

Yeah 9.8-10cm sidewall is also my borderline, wouldn't want to go lower than that. Best is keep between 10-11cm.

As for tires recommendation, I'd also suggest the Falken Fk510 especially for 19' because have heard many good reviews on it and the price range is much more affordable for 19' especially considering it's still made in Japan.

For what car is this? 275/35 is much taller than 245/35 though, 275/30 could be a better match.

275/35 will give you 9.6cm sidewall while your front at 245/35 only has 8.6 cm so the rear will look visibly thicker. What were the stock sizes?

Ic, any reason why you're considering to go up to 275?