Is a a move to consider?
I'm a little worried that my stones will get over concentrated, but I also think I will eventually have to escape to the center with them, so I need to make them safe.
Frankmartin I think a is a proper move. Do you think Black is overconcentrated without the cutting stone and a? Anyway the exchange of j4 and a is good for Black. The whole board position does not require fast play. Leaving the cutting stone uncaught means bad aji for Black and good aji for White.