I think overly wet is not good for this species. I found a mix of LFS, perlite and orchid bark top watered and not sitting in water worked well. It seems to want a lot of room to run ( large pots or the like). Your peat/lfs sounds like it would be too wet....
Check your pot by dumping it out in your hand. If there are healthy thick white stolons (rolons!) down there there you are ok and the plant will likely return! If you have nothing, well join the club!
Remember that Peter D'Amato has a greenhouse in Ca. and his plants no doubt are flowering all season. His bricks probably flower too. For most mere mortals growing this, flowering is an annual spring event, but my oh my oh my is it worth it!
There is a guy in Australia grows his in potting soil
with monthly fertilizing with an orchid fertilizer, watered from the top weeekly like a houseplant. His flowers all year too, but he also has a GH.
Growth slowed in the fall, but never really ceased on my plant. A grower in England I know freezes (lightly) his plants and says it promotes good growth and heavy spring flowering. (He also freezes his U. praelonga to the same end). My sparse flowering might be due to the lack of a good "dormancy" or rest. It may be your plant will return stronger than ever after its nap.
My plant was tortured by freezing, sunburn, shelf collapse, drying out, bird pecking, cat eating and squirrel shredding but it always returned after a month or so rest. When it sat too long in water, I lost it to rot.
With the larger Utricularia, you have to feeeeelll your way a little. If the plant is in obvious growth, a bit wetter. If inactive, let it dry out between waterings to the point where there is no live LFS possible, but is damp feeling and not crisp. The moss can be bone dry and the rolons will still be white and firm in U. reniformis, so better to err in that direction I think. These rolons need to be maintained from total drying out but no more than that . When new growth is evident, step up the waterings until the moss is growing again too. If you get a forest of leaves, let the plant sit in water for a few days on occasion so there is water available for the lolons and not having to take it from the rolons which then should continue to swell and thicken and the plant maintains its reserves.
By observation, the large form seems to prefer less wet conditions vs the smaller form. I note the small form escapes through the drain holes in the pots and prospers in the water tray without any medium whatsoever. The large form seems to keep its lolons closer to the pot surface, possibly avoiding the wetness closer to the bottom, but this is speculation as I haven't grown enough individuals to be sure.
In habitat the plant is found pretty much in all stages of wet and dry, probably accounting for the different schools of thought on the cultivation of this species that rattler mentions.
Hope this helps, and good luck.