HX50 and AB1 coverage in Chile

Trying to find out if anyone has successfully managed to lock in to Atlantic Bird 1 from any area close to southern chile.  Location is 48s and 73w using a 1.8 m dish.   Have been looking for a signal with little success:
Elevation: 10deg ( dish pointing down 12.5 for offset)
Azimuth: 55
Polarization: 38
Above are all approximate as I have scanned all around these parameters. 

Using Horizon meter have a max reading of 70 db and a max reading of 22 on hx50 signal strength meter at the direction of what I an sure is AB1.

Any suggestions would be greatly appreciated.  Thanks in advance

The dish is a TYPE 183 ANDREW with a 22.6deg offset angle.
I also had the advantage of a Furuno Sat Compass  on a boat about 100m from the Dish location so nailing down true and magnetic north was pretty simple. (Was even close to the compass on my Iphone which was surprising)

A pretty thorough scan has been done of all points from N to E at elevation angles -18 to 25 just to be thorough.   Spent 3 days looking for a lock so concerned that signal strength at this location may just be too weak.

Any additional comments or suggestions would be appreciated.

Thanks for the prompt responses.
  The HX 50 config file is supposed to be set correctly according to the techs at B-W (it was preinstalled and I have confirmed settings).  The same goes for the Horizon meter although I cannot confirm settings as the Atlantic Bird South America just comes up as one of the factory satellites so do not know exactly what parameters are set in the meter.

Best regards, Eric

It makes sense to tilt the front face of the dish 12.5 deg forwards in order to get a beam elevation of 10 deg.
(22.5 - 12.5 = 10 )

If you have an inclinometer place it on a plank of wood and hold it at a 10 deg slope.  Get someone to look along the wood.  If they can see clear sky above the mountains then your dish can see the satellite.

At a beam elevation angle of 10 deg you may find that the bottom rear metalwork of the dish spine almost hits the pole.

If you get a signal level of 22 and the elevation angle seems right you have probably found the wanted satellite.  Peak up.

22 is a reasonable, but not brillant signal. The scale range is 0 to 29. The maximum for the signal power range is 29

The reason the 22 won't make the modem RX LED come on and the reading jump up to some signal quality reading like 80 with RX LED ON, is that one or more of the following are still wrong:

Polarisation initial setting and polarisation adjustment amount:  You need to start with the LNB pointing either directly upwards or sideways (the two different polarisation names). From either of these starting positions you need to turn the feed 37 deg clockwise as viewed from behind the dish and facing forwards towards the satellite in the sky (to the north east). You can quickly try both polarisation names by turning the feed 90 deg between the two alternative +37 adjusted positions.  One position will work perectly, the other not at all.  You may get good power readings at all angles.

Configuration settings:  Frequency, symbol rate, 22kHz tone ON/OFF and LNB menu type are important.  If there are errors then the modem receiver won't lock, even if peaked up on the wanted satellite (level=22).
Can you read out the information from the manual configuration screen?.  What is your LNB type and model number ?

Best regards, Eric.