Should I decrease the amount of time I practice concentration meditation?
Concentration meditation is only a tool to temporary suppress your problems and hindrances.  It is not a self-contained technique for eradicating them.  This was one of the Buddha's great discoveries - an obstacle that he saw past when he was under the teaching of Uddaka Ramaputta and Alara Kalama.  Concentration is only valuable insofar as it aids in insight practice.  As the Buddha says, “When my concentrated mind [in the fourth jhana] was thus purified, bright, unblemished, rid of imperfection, malleable, wieldy, steady, and attained to imperturbability, I directed it to..." (MN 36.38).  The malleable and clear mind that you enjoy following samadhi is not an end in itself but needs to be directed back to the world of form.  That includes all of your mental hangups, psychological issues, etc.  The techniques for doing this are vast and include everything from mindfulness practices to Zen koans.

Ultimately, concentration meditation and insight practice go hand in hand.  They add value and support to each other making either practice greater than it would be on its own.  You don't need to abandon samadhi practice.  Just make sure you are using it effectively.