Sorry for the delayed reply. No, too warm won’t cause warping. However, the hold side of your hot end will at best be ambient temperature. If it gets too warm you can clog your nozzle.

My view is “if the chamber doesn’t need to be hotter why make it hotter?”.

If you were printing ASA/ABS you want your chamber to go basically as hot as you can get it though - especially if you’re printing something big.