I hope youre at least carrying a full spare mag for a reload, and understand why you do.
Most of what you've said really makes no sense. If you dont have what you need on you, when you need it, you dont have it. The slight difference in size and weight between all but the smallest of guns, really makes no difference in carrying them, so why would you choose less over more, when there is so little difference?
Carry and do what you want, but from the sounds of what you've said, Id suggest you get some realistic training, so you have a better understanding of the hows and whys of things.