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You must peak on your true south satellite. If you don't it will gradually throw everything else off the further away from the satellite that you peaked on. You will gradually drop below the clark belt on one end of the arc and be above the belt on the other end.
Your best sat according to your long would be AMC-6. As you can see if you look on a sat service that there are no full time mpeg carriers on there but you can try an ip data carrier. Try 12060H sr 13022....This IP provider belongs to synergistic communications and is full time 24/7. I would set up my due south on this sat preferably even if there is nothing else on their that interests you.
You really want the KU band satellite the closest to your site long as possible. The other thing to check is that your mounting pole is perfectly plumb. Even a half a bubble off on the level is enough to upset the apple cart on the far edges of the arc. If your mount is plumb and you peak on your true south satellite it will eliminate the lion's share of the trouble your getting....and yes, quite often there is a big difference in carrier power levels on individual transponders. The direct broadcast transponders are usually the strongest as they are meant for the end user. The network feeds, backhauls and SNG feeds are usually much weaker as there is a big downlink antenna on the other end. They try to use the least amount of power as possible to get the job done.
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