As I said on the guide, Scouts work better with Leather.
A full Leather provide more crit and expand your crit cap to 60% (50% without it). Furthermore, it will be buffed in future patches. It will give additional 15% Phys and Magic damage.
Don’t worry, you won’t have trouble getting lvl 400 primus equipment. I believe you can get a transcended piece or two. But I would recommend you getting Savinose Pistol and Dagger first, this way you can use the 5 Trans Scroll from the event. It will really give you a good “comeback start”.