Peat free compost/grow bags - anyone had good results?

As we will soon be unable to buy anything other than peat free composts (and I understand the reasons why), I wondered how other gardeners had fared with peat free grow-bags? I tried a couple this year and the results were dismal compared to those grown in ordinary bagged compost used in pots. I'm starting to panic ahead of next year...

I'm also wondering if anyone has tried mixing their own compost from topsoil, manure and fertiliser and if they have a good "recipe" I can try for my tomatoes, peppers and chillies in pots.

Any advice or recommendations gratefully received!