We suffer from "snake-bites". We use a 700x34 as a back wheel, it stands 3.5 Bar/50 PSI. It seems to be not enough for light gravel. My wife is absolutely not heavy, she is tiny and very slim. I am not heavy as well and we don't carry much luggage with us. Should we use 700x38 or even broader? Should we go for more pressure?

Thanks for your advice