one way to improve the PSR is resetting, which shorted the IDETTIM (core side) and T3212 (radio side) timer.
IDETTIM timer (implisit detach time) as the timer for MSC to renew it’s database. user whom didn’t make any activity during the timer hour will be requested to make auto location update. of course it makes, which subscriber on old database but not locupd will detach.
but before, shorted the timer, please make sure your SD blocking. it will impact.