Yo you drawings are really cool, and do not worry about drawing too much countour, you are doing really great with gesture! what i spot on here is that you kinda do a little bit of chicken scratching (like really just a little bit), like, on the first one, aaand, maybe you are pressing to hard on the paper?. What i recommend if you caught yourself stuck in improving that, is practicing with I N K, it will really help you out to figure both gesture and countours, cuz, you know, once it touches the paper, it leaves a strong, non erasable mark. But for now, No worries my friend!

Looking at the 2 minute drawings specifically, I don't think you're getting too caught up in the contours. There are some really beautiful rhythms here. Continuing to do these quick studies in conjunction with structural anatomy drawings will help you so much in the long run!