Thanks for the reply. I'm not the most confident in zBrush. I can sculpt stuff pretty well but prefer to do my PS work in photoshop etc. I instead used the 'Viewport Canvas' Tool in 3DS Max to paint over the seams on the diffuse.
I wasn't happy with the texture on those rocks from last night and decided to take BreaK's advice and make it a cooler colour, a little more neutral. I took a lot of the large details out of the texture and just used a bit of dodge and burn to accentuate the details from the Normal Bake. This helped show off the normal maps a bit more (they were kinda hidden before) and also allows me to put a snow texture on later on quite easily.
I have two rock variation, at 300tris each and 512 diff/spec/norm. Moving onto texturing and finishing the Houses now.