You may have to run the importer multiple times since few of the hosting providers allocate little memory to the account. If you still have issues, please send me a temp login to your installation and I will help you out.
Regarding the sliders, You can use any of them. In our demo we have used the Revolution Slider on the home page.
At present, everything looks great, all the data is imported, but I would strongly advise you to get your server configuration checked once. We have seen this issue just once or twice so far for all our themes and hence it is not something very common which makes it all more difficult to debug the root cause.