Hi, regarding your question on attacking gatecampers in a 'Rax:
As with most scenarios in eve.. It depends. However,the simple answer I think is No, If it were the case that a well fitted cruiser could take a gate camp, then that gate camp would incredibly poor, what would they do if a couple of Battleships were to jump in?
Concerning Instas: just go 10km behind the place that you would like to come out of warp, hit People and Places tab and create a bookmark, practice on some stargates, u'll find after a go or two you will be making perfect instas. Then all you do is right click in space, select the insta and select warp to within 15km.
Also I see you are shield tanking your Thorax. In my opinion it is best Armor tanked, sorry if this is patronising and you are aware of this, but Tanking is the process in which you absorb damage into your shields or armor. The Thorax can be armor tanked very nicely and doesnt drain your cap like shield tanking will, not to say that shield tanking is inferior in general, just the 'Rax is better armor tanked imo.
Hope that helps