A lot of it will depend on how much friction your lanes have. While the patterns themselves are effectively the same, every house plays different. Brand new synthetics won't give you as much early grab as old wood lanes, for example. On newer synthetics, I had good success with balls drilled for length on Viper once the shot broke down a bit. However, on fresh oil, they tended to be a little jumpy. You will probably need to have some of your equipment slightly sanded (hit it with some 1500-2000 abralon maybe) and some of your equipment slightly polished. The heads can get pretty dry on Viper and you can open the lanes up, but on fresh you're going to want a little more of a direct line and a little more of an arc than a skid/snap reaction in my opinion.