Yes it is very common to have dry eyes after lasik . Continue with your lubricant eye drops.  As far as 6/6 vision is concerned it might take another 2-3 weeks for your refraction to stabilize. If u r comfortable with ur vision then 6/6 is just a number.  Dont think too much about it too much.  But if ur vision is compromised then there are options like retreatment if adequate corneal thickness is available.