@jaybee3014,

basically, scryptn is the superset of scrypt with variable n, while classical scrypt coins has N constant equals 10.  Currently and up to 2016 vtc will have N = 11.  So the calculations are more complex, so you will have currently around half of your usual LTC hashrate.

On 270x I was able to get up to 225 Kh/s for scryptn and that is reported by some other users too as its upper limit.  But this is only on intensity 20 that makes a lot of HW errors.  So, currently I mine on intensity 18 that reduces my hashrate to 215 Kh/s but reduces HW errors from  115/day to 20/day.