I think you're right on track with your protein amount.

The RDA is 0.8 gram protein per kilo of body weight so you're right in the ballpark at 50. I keep mine to about 50 a day as well, my RDA is just a little lower than yours.

I'm not vegan but I don't eat meat, either. I get protein from nonfat dairy, egg whites, veggies, and nuts. I just got turned on to Quorn and will add it intermittently to my diet as well, but where I live it's pretty expensive.

What's your daily calorie number like?