The interval could be lowered dynamically changing the value of TRAN-SUMMARY event on the CSCHEDUL display changing column EVERY from 15min (default) to 5min, and then it could be changed on the Sysview Parmlib member CICSSCHD, EVERY parameter:
DEFINE TRAN-SUMMARY DESC 'Transaction Summary - Interval Records '
GROUP CICSDATA
TYPE RECUR
ALLDAYS
DATEBEGIN * DATEEND *
TIMEBEGIN MIDNIGHT TIMEEND *
EVERY 5MINS
LIMIT NOLIMIT
FUNCTION TRAN-SUMMARY
ENABLED
ENDDEFINE