Super tweeter to FANE 12-250

My speakers are filtered FANE SOVEREIGN 12-250 in a sealed box. First build, very enjoyable so far. As an experiment, I have bought a pair of cheap GRS BTR3-8 bullet tweeters. My aims are to reduce beaming and to add a little bit of air to the top end. But most of all to learn along the way.
Please, find atttached, a couple of measurements I have made with a 47uF capacitor in series with the tweeter. On axis and 30 degress off @ 1.1m. The measurements are presented with FR driver measurements respectively at the same distances and angles.

I would like to get some recommendations on how to proceed further. Should I try to XSIM the response? What should I look for for smooth integration? I have some Wima MKS4 caps 1uF, 0.5 uF, 0.1 uF caps at hand to help me.
 

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