Hi Marion,
BI/TCT Content for BW Statistics is meant for OLAP (performance) analysis, not for OLTP (performance) analysis such as a response time of a certain transaction. To my knowledge there is no BI Content for this purpose.
I suggest to explore the traditional performance analysis tooling in the SAP system. You might also want to explore Solution Manager for such tools or reporting options. By the way, 6 weeks of analysis data is quite a lot in my opinion.
Best regards,
Sander