WireGuard - AllowedIP limit on OPNsense?

[Koloa]

I have a need to have around 160 subnets defined in AllowedIPs for a WireGuard endpoint - this works just fine on a separate dedicated WireGuard device I have on my network, but, on the OPNsense, at some point in adding subnets to the list, the wg interface never comes up.

Whilst I can see the wg3.conf interface in /usr/local/etc/wireguard on the OPNsense system, the file empties out if I disable WG - so I'm not really sure where it's storing the data BEFORE it goes into this file (something that the UI is generating?).

I also tried modifying wg3.conf myself, and restarting WireGuard, but, the problem persists.

I'll try iteratively adding subnets till I find the breaking point, but that could take a bit. 

Anyone encountered this?

Is there another/better way to accomplish the same goal, such as by using Gateways and Routes (and maybe NAT?).

I was definitely able to add a few extra AllowedIPs to the list, and it worked fine, but, after a few, the interface never comes up and WireGuard never establishes a handshake.  Since I know WG itself can handle this, I'm guessing there's a glitch in processing the number of them that I need to process.

Open to other suggestions on how best to solve this!