It’s best to follow the manufacture’s tire size recommendations. Their design engineers extensively tested the suspension and steering on your car for those tire sizes, and found the vehicle tracked well, had even tire wear, and was as stable as possible by design going over bumps, around corners, on pavement as well as gravel and dirt roads, rain slick roads, snow covered roads, etc. So I can’t recommend any other tire size than what the manufacturer recommended to you. However, I’ll add that if I had that problem myself, given the small difference involved, I just drive more cautiously until it was time to buy new tires, and correct the tire size issue at that time.
Re different tire treads, front and back. Ideally you’d like to have all four tires exactly the same. This is usually required for AWD and 4WD. For 2WD, next best is the same tires on an axle; i.e. right == left, but front might not be the same as back. Any deviation beyond that, I wouldn’t recommend.