On my phone right now, so I don't have a detailed guide for you but the easy way to approach this is to use a symbol scaled at 1.0 as a guide when making your new symbol.

When you define a new symbol, CC3 assumes the size you make it in is the default scale.

And scaling it to 1.06 in the symbol manager won't do much, as that just enlarges it by a tiny amount. To set it right you need to scale it to something like 0.22. Remember, scale 1.0 is the size you made it at, so anything above 1 when scaling makes it larger.

This happens because the background is a fill without scaling configured. This means it will repeat to fill the area depending on the resolution, so a high-resolution export will have many more pixels than on-screen display, thereby causing to repeat more.

To fix it, you'll need to click the fill style indicator in the top right, go to the bitmap files tab, find the relevant fill in the dropdown, and then check the "Scaled" option for the fill, and provide proper values for the X/Y size of the scaling. You'll need to experiment with those values to find the correct setting, but once you've found something that works on screen, since it now is scaled, it should then be the same size on exports.

You need to make three copies of the fill. Just select the fill you want to duplicate in the fill style dialog, and hit New and give it a name. This will give you two different fills, but still pointing to the same file on disk, and you can then adjust each individually. Just repeat for the third one.

That's just how copyrights works unfortunately. It's still their material to do what they want with even if the products isn't available anymore.

Even if WOTC doesn't keep the patches on their site any more, they're still available using archive.org though. I just tested the links, and they work fine.

Looking at the coordinate readout on your screenshot, that second map looks to be absolutely tiny. Your cursor is all the way to the right of the map, and it reads (209,55) , meaning your entire map is less than 200 meters wide, while the top map, if the scale bar is to be trusted, is about 2500m wide.

The "road wide" tool (I see your collections are collapsed, so I assume you use the default tool in the collection, which happen to be the imperial version) is 36 map units wide, so for a map that is approximately ~100 map units tall, that result looks pretty correct.

So, it doesn't seem to be a problem with the tools themselves, but rather your map size. The first obvious question is obviously, are you sure you set it up correctly when creating it, because it is clearly not the size of the map from your other image. Assuming you did, have you perhaps changed anything in the Map Units setting (File -> Drawing Properties -> Drawing Units), or re-scaled it using File -> Resize drawing area? Or even manually resized it using the :CC2SCALE: tool?