Recommended tire pressures on the door sticker is also not really accurate or must be strictly followed. It serves more as a starting point for you to adjsut until you find the right one for you. It depends on your preference how you like the car to handle. If you feel the recommended pressures is too hard then can reduce bit by bit but usually don't go too low below 28psi. On the other hand if you feel it's too soft then can also increase bit by bit until you find the sweet spot for you, as long as it's not exceeding the max pressures. Note though over inflating a bit higher than recommended is generally less risky than under inflating it by the same amount coz under inflation can cause heat build up easier during high speeds. That's why I personally almost always inflate around 2-3psi higher than recommended. Over inflating a bit also serves as an extra margin so that when you loose pressure you will still arrive at around the recommended pressure and not too low below it.

Usually tire pressure recommendation is largely determined based on the weight distribution. If the car is front heavy much more, then usually the recommended pressures are higher for the front. If you make them even then you may feel the rear becomes a bit jumpy/harsh, unless you have extra load at the back.

If you feel too harsh then just lower it back to std recommendation, maybe that's already the best compromise between handling and comfort.

How so?? That doesn't make sense.

Pump 1 more psi should not make much noticeable difference but it also should not make the FC worse. I suspect is more about the driving style or the tires. You need to measure correctly also to really draw a conclusion.

See tire pressures actually also will steadily/slowly go down bit by bit. So for example when I pump 35psi on my car, after maybe 3 weeks or so, the pressures will already drop to around 32psi, sometime more, sometime less. The FC when I was on 32-33psi seems to still be about the same as when I was using 34-35psi, or at least not significant enough of a difference to conclude. However I think my best FC record was achieved when my tires were at 34-35psi. Note that I measure my FC practically every full tank, meaning every time I refill full then divide by distance traveled, so it's real average FC and not based on econometer estimates.

Just keep it there. What pressure that you need to maintain is depending on your most frequent driving condition, don;t need to be so impractical and keep changing back & forth. For example myself, since I often reach highway speeds so then I maintain about 3 psi above std recommended pressure. As I explain also above that this is a precaution/margin too so that if the pressure drops, it will still be around the recommended pressure. In short, use the pressure that suits your driving the most and maintain that. However note that over inflating a bit above the recommended is safer than under inflating as under inflating tends to build up surface heat faster and therefore higher risk of blow out.