I have some tips for nilesat H transponders.
Try changing the S/R to 27499. I have done a few blind scans and some H transponders show 27499 instead of 27500.
Also i find dropping the frequency by 1 or 2 helps(some some lnbs can have some frequency drift + or - 1 or 2)
or this could be complete nonsense
Set up of the dish is important , just a few mm and the weaker transponders can drift. Even strong wind can make the dish bounce and lose the weak H transponders.
tip 1 - Clean the face of the dish of all dust and clean the lnb cap.
tip 2 - Use the best cable you can afford.
tip 3 - Don’t try and set up the dish in the afternoon as all transponders dive in strength from 3pm-5pm.
tip 3 - Try and align the dish from 9pm(in the UK) as you can make fine mm adjustments that will help you get the weaker H transponders.
tip 4 - Clear sky is the best for H transponders .Even light to medium cloud can drop a few % on the quality.
tip 5 - If the dish is on a motor then set the motor to 0.
Make sure the dish bracket is perfect centre on the motor.
Use a spirt level for all angles of the pole.
Stick a spirt level down the side of the motor bracket and check.
Balance a sprit level on the back side of the dish bracket and check.
Make sure the lnb arm holder is level.
Balance a level on top of the lnb and check.(works with sharp lnb)
Try all adjustments moving the lnb forward and back.
Now drive you motor to 7W
Dont use the loop through on the motor.(this can have a large loss on some frequencys) Cable the lnb direct to the reciver and drive the motor from a second reciever.
I hope this helps get some of those H transponders.;)