R610 started supporting on ZD from 9.9.x and above firmware versions and ZF7962 is only supported till 9.8.3.x, so there is no way you can use both at the same time, on ZD.
You have to decide if you want to use R610 or 7962, since ZD can only support one firmware at a time.
A possible solution is to buy SZ-100 or vSZ and then you can use both APs, as v/SZ supports three major firmware versions under different AP zones (Each AP zone in v/SZ equals to a ZD).
For performance issues on ZF7962, please refer the release notes and below article.https://support.ruckuswireless.com/documents/2113-zonedirector-9-8-3-mr3-refresh2-release-notes/down... https://support.ruckuswireless.com/articles/000004185
Syamantak Omer | Community moderator | Sr.Staff TSE | CWNA | CCNA | RASZA | RICXI