I think you need to clean a lot of your workflow, (sorry if this has been mentioned above) Your normal maps appear to be generated from crazybump? Your diffuse maps super busy for the style. Usually the diffuse doesn't need more than just color info. save that stuff for the Spec map. Find references for the materials…
Does triangulation really matter on a high poly mesh that is just being used for a Normal Map transfer? What does edge flow not being smooth mean? The high poly edges look smooth to me in the areas where they need to be smooth. Yep, that was the texture on the image reference, it's just a white hydrant. Well like I said,…
You're comments are a bit vague. You say lighting is terrible, but you don't say why that is. The Unreal objects are being lit using Unreal lights, I don't see what more there is to do with them. You say my texture/UV skills are low, but don't give any examples once again. Also, you wish for me to re UV those Unreal…