Unfortunately you wrapped it up in your own recommendations which made it look like I recommended that action.
As for the unchecking the Check for unauthorised system modifications, that was more of a fault checking process to see if that resolves a conflict. I haven't got that option unchecked on my system and I have no problem with Outpost Firewall Pro's system and Application Guard enabled.
Site blacklists don't do squat against hacked sites as they aren't doing real-time scans as the web shield is, believe me they simply don't compare. But its your system do as you please, but please don't offer advice that could put others at greater risk by disabling the web and network shields...
The network shield also gets updates from the communityIQ function where there are detections by the web shield, that cumulative information would add the domain to the network shields malicious sites list. It is also monitoring the common exploit ports and if you care to browse the viruses and worms for DCOM and LSASS you will see many such alerts by the network shield, even when the user has another firewall. So it is providing a useful backup in that area.
So you have the information, make your own mind up, but I'm done wasting any more time on it.