I'm not sure what size condom to use. Erect im 8" x 6". When i first started using condom i tried both regular trojans and durex. Both fit snug. Pretty snug. I bought some magnums and they fit snug around the shaft but give more room around the head. I'm not sure which condoms I should be using. The standard trojans are really tight, sometimes painful, and im concerned about them breaking on me. The magnums fit great around the shaft, but give more around the head... What is a better fit for me?