From what I understand your Astra blades don’t fair well when used with water, making me think that they are not as stainless as your older ones. If they are damp they can rust ever so slightly on the apex and you will feel that. This goes for any blade but: make sure to dry them well before storing away. Store blades and razors outside the bathroom. In the humid months (right now) I take a hair dryer to my straight razors even after drying with a towel and paper. You can try and strop them on your jeans quickly before shaving as well. All small things but together it can really help make your edge/blade last longer. I only use straights so I don’t have a blade recommendation unfortunately.