Thanks for the replies guys. I added the following and it seems to be catching up pretty quick now
-s 1 --expiry 25 --queue 0
I suppose the expiry needs to be little less than average block time (which is 30 seconds for infinitecoin and 2.5min for litecoin)
Yep, it's always going to depend on the particular situation at hand. New coins usually need 0 queue and a low expiry whilst more established ones can run fine with the default. Just like the --gpu-engine and --gpu-memclock all the options require a little love to get them running perfect. Glad you got it fixed