Send custom GATT characteristics using HM-10 (actually a CC2541)
AT+NOTI unfortunately is not the correct command. The manual states:

AT+NOTI[P1]
If this value is set to 1, when link ESTABLISHED or LOSTED module will send
OK+CONN or OK+LOST string through UART.

I believe, it's not possible to do what you want. I've been searching my whole day, but there is only this one custom characteristics, and you can change only the short UUID. I found no way to get data from other UUIDs in Central mode.
Here is some more info: BLECentral - HM-10 BLE Module
Edit: With new Firmware version &gt; V546, there is a possibility to use 128 Bit UUIds. A readme + the needed software is located here: jnhuamao Website.
And V605 states:

Unfortunately, I did not succeed to update the Firmware yet.