Internet stalling on various services.

[daelos]

I'm pretty new to OpnSense so still feeling around most settings.

I have installed an Opnsense router but I'm having issues with certain services just not connecting, stalling and needing refreshes to get them to work,etc. Most sites work fine but it seems ones with enhanced security fail (banking apps on phones etc) I've checked DNS and fixed some big buffer bloat issues by tweaking the Shaper/codel settings but we're still having issues.

Dashboard interface stats is not reporting any errors or collisions.
IPV6 is off. 
I tweaked the MTU so packets aren't being fragmented.

Anything else I need to look at? What logs are most useful for diagnosing this problem and where can I find them?