I have a 4-16x44 Mamba lite on my TX and a Viper 10x44 on my R10. They were the other way round and things just weren't quite right. Once I'd swapped them over things just clicked. I really want to have a go at hft but spend most of my time either hunting or on the range. I too found the problem with the milkiness unless there was proper eye alignment but am working on my consistency.
Daystate Regal .177 Mamba Lite 4-16x44 Belita moderator
Crosman Ratcatcher, custom breech, QGS mod, 4x32
Original 52 .177