DM800se - First USALS setup and SAT Positioning.

[gerb68]

I have had a DM800se for few years now and I have just completed a USALS setup with a motorised dish (Diseqc 1.2). I have positioned my satellite for 28.e, Fine tuned the positioned and locked it. Most of the channels have a good signal rate(SNR) and are perfect but a small few channels are glitching because they have a low signal rate of 20/21%.
How can I correct this? I thought if they came from the same satellite they would have reasonably the same signal rate.
Do I have to fine tune these channels individually and then lock them in their position or am I missing something?
Any help would be greatly received.
Thanx
Ger

[digicon]

There are Astra 2A,1N,2F as well as Eutelsat 28A & 28B co located at 28.2? east and each one of these due to age have differing power levels so yes there will be some discrepancy but not enough to give poor signal