I did use a real straight. I don't have time to strop/maintain one. I can go 3 days without shaving until I have to shave. My hair curls into my skin so it can't get too long.Try a real straight. The blades you are using could be too harsh. Use Tend Skin to heal the bumps. Stop shaving for a little while so the skin can heal. Then, when you start back, just do one pass. Gradually build up to more than one pass.
I have similar issues and have made my own Tend Skin based on youtube videos from cheap drug store supplies. I started using it today. Maybe it will work for you?