The one medium I would add is the so-called 'premium peat'. It seems to be taken from a median layer in the bog between the long-fibered sphagnum and the standard dark peat. It is much coarser and provides for a lighter soil mix. I sometimes use it mixed with a small amount of sand. It is much more expensive than standard peat and generally must be bought online but it has its place. 'Less dense than peat also less airy than lfs.
I generally grow petiolaris sundews in peat and a relatively high percentage of sand.
A cold one that is not cold is scarcely a one at all. - SB