I too have been having problems since the peat free came in.
Some of it, even from reputable brands, is terrible, barely composted, full of lumps and sticks. I tried making a worm/slug/snail sized gash in the sack and leaving it to overwinter which helped to a certain extent with the consistency but germination is poor with seeds either rotting or popping their shoots through, looking round and deciding not to bother.
I have been experimenting with making my own mixture, too course mixed with overly fine (non water retaining) adding either vermiculite to help retain/release water and or pearlite to open up the clag and perhaps a few handfuls of our poor, sandy, gritty local "soil", depending on what I am trying to grow.
100% germination failure on 20 corn kernels first time round. A second planting with a different combination and I have spotted 25% germination so far (early days) but they look a bit scrawny. Even pansy seeds failed and they are usually no problem.
Last year I was at RHS Wisley and mentioned the problems I was having to one of the staff. The lady threw up her hands and said "If you find a solution, please let us know!"