Always try to get as much quality as you can, when you think you have the best you can get tighten down the dish, then from behind the dish pull slightly on one side of the dish watch the quality if it goes up the dish should be moved, do this to the left side of dish then right side then top and bottom, if the quality drops when you pull on each side you are maxed out on quality. Then move to the LNB, rotate it slightly one way then the other and get as much quality as you can, lastly move the LNB closer and further away from the dish to the best focal point again its all about quality.
The signal quality sounds good for IA-6 for a Satwork receiver as the levels are set low on it, if another kind of receiver is used you should be getting more signal quality.
I would trust Lyngsat for your frequencies and symbol rates as every receiver and LNBF is slightly out to each other, especially if you use blind scan it just stops where it first gets signal, again TRUST lyngsat.
Fox news (IA-6) is weaker than all the other channels so it should pop in with a manual entry after you max out the quality, the University channel should be blasting in, a few weeks ago I had great signal on it using a 21" dish, remember you can always give me a call if you are stuck.