SSL Handshake failure

The odd thing is that you're actually completing the SSL handshake (it's the application_data messages). And it looks like you're doing mutual (client certificate) authentication successfully.

Since you're doing an RSA handshake, you should be able to put the server's private key into the SSLDUMP and attempt to decrypt.

ssldump -AdNn -i [interface] -k [path to private key] port 443 [and additional filters]

There's something happening just after the handshake that's causing the issue, so it'll help to see the decrypted payload.