Roland Octa-capture MIDI driver question

The latency you are experiencing is likely an audio issue. It depends on the audio buffer setting for the interface and plug-in delay compensation used by the DAW to keep everything in sync.
 
To see if plug-ins are the problem toggle the FX button in the Mix Module to bypass all plug-ins (keyboard shortcut E). If the delay goes away when the FX plug-ins are bypassed, the problem is plug-in delay compensation. While reading about the FX button also check out the PDC button.
 
In this case, my guess is the audio driver and buffer setting are the issue. Roland supplies ASIO drivers for their interfaces. As a rule, manufacturer supplied ASIO perform better than WDM. MME is the worst performer of them all. If ASIO is not an option in CbB driver mode preferences, install the ASIO driver from the Roland website. Then set the buffers in the client supplied by Roland.
 
Note: this has nothing to do with the MIDI driver mode.
 
From a performance perspective it does not matter whether the controller is connected through the MIDI DIN connectors on the audio interface or USB. The MIDI connection is not the problem.

The audio drivers are involved in everything you hear from the DAW.
 
It does not take much time for MIDI data to get to the soft synth, the synth to interpret the data and generate the sound.
 
The delay happens when the DAW is sending audio back to you. This is where all the buffering adds up to create "MIDI latency", the delay between pressing a key and hearing the sound. As mentioned above buffers involved are the ASIO buffer setting and the buffering used by the DAW to compensate for FX plug-ins in the project that need time to process data. Not all FX plug-ins require large amounts of time to process data. Typically mixing and mastering plug-ins such as dynamics processors (compressors and limiters) and impulse response reverbs are the issue. The plug-ins could be anywhere in the project. This is why the easy test is bypassing all plug-ins using the FX button in the MIX module. If the delay changes, it is at least partially due to plug-ins. If not, it is solely due to the interface buffer setting.
 

ASIO is an audio specification. An ASIO driver will not show up anywhere in MIDI settings.
 
The MIDI driver mode options MME and UWP are not causing the issue described in the OP. These are the only options. MIDI driver modes is a Windows thing and has nothing to do with Roland or the Octa-Capture. Focus on the audio setup.

Btw, midi latency is a lot better via standard midi versus USB on my Studio-Captures.