Since my last post I didn't grow in week number. I had a numb foot problem. In addition to feet numbness thigh pain appeared.
Since then I've bought new trainers, which are of a bigger size and made for runners. I also stepped back a bit - skipped last 5 minutes run for a couple of runs. Looks like due to this actions, both numbness and thigh pain seems to start fading away.
Today I ran the full W4 run, and there was almost no numbness. Seems, I'm back on track!
And - without special efforts - I run faster now according to Runtastic app.