when u do a 87 oct and a modify tune do u gain the horse power are it stays with the stock horse power and I have 2007 single cab dodge hemi sport 1500

when I go to tuningsuperstore.com it all ways tells me error on page when I try to get a custom tune. any suggestions are why its doing that?

I just order a diablo predator u7137x for my dodge 2007 hemi sport and the programmer is making my truck shift really hard. how do I change that and if there is away to change it. if I have to download a custom tune how do I do that? thanks Ronnie