Hmmmm indeed - ive been scratching my head since as something just wasn't right.
This might be relevant for
@Manikm909 troublesome time with the ESPN tp - Eventually tracked the problem down to my Norsat PLL lnb. This has been giving good results with linear tp's but for some reason it was giving trouble with ESPN.
Anyway - after a lot of trying / changing different lnb's i ended up with our old friend the 'Astrotel Precision Gold' 15K
DRO lnb - this gave me about a 2dB increase reading on the Promax to 12dB max and was a solid lock and viewable without drop out's from about 8dB upwards.
Other lnb's tried: Norsat DRO, better results than the PLL.
Gardiner 17K Mini lnb, works ok but similar to Norsat DRO lnb.
Iv'e got another mini BWEi DRO lnb with inbuilt 5G filter to try but i can't see it beating the 'Gold lnb.
All my swaps etc used the AliExpress External 5G filter before the test lnb.
So,
@Manikm909 - might be worth trying a standard DRO lnbf as a test ??.