No it isn't enough. That's why they made the 357. It's why LE doesn't use 38 special anymore. Carrying for self defense is about "self defense". It's not a contest to see who can carry the smallest gun.
The average lightweight 38spl revolver weighs about 16 oz loaded. My SP101 weighs 28 oz loaded and has boot grips. I would not like to shoot 357 in a lighter gun in that configuration. Yes larger Hogue grips will handle better but they are less concealable. The 38spl has been doing the job for a long time and modern ammo has made it a better performer. If you feel you need more then get an semi auto with a higher round count. 11 rounds in a Ruger SR9c will weigh in at 28 oz also and there is not a lot of difference between a 357 from a snub and a 9mm from a 3.5" barrel. You can use the chart below to see how well the rounds work in short barrels. http://www.ballisticsbytheinch.com/22.html
Patron Member NRA
"I would not be an old man if I had not been an armed young man." JTJ
I am not older than dirt but the rocks were bigger and there were more of them when I was a kid.