These are both perfectly normal "complaints" with a shield that isn't broken in yet. Once the gun gets 300-500rds through it the slide stop will loosen up a bit and allow you to drop the slide with it. In the mean time just run the slide on reloads. As for the 7rd mag being hard to seat, fully load it and let it sit for a few days. This will break the spring in a bit and make it easier to seat. It will always be harder to seat than the 8rd mag, but will be significantly easier after break in. I read about these same exact complaints constantly when people announce they have bought a new shield. I had the same issues with mine when I bought it back in mid 2013. Mine has been absolutely flawless through the last 2000rds, but was very stiff when I first pulled it out of the box.
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