Thanks very much for all replies everyone.
I'll try to stick with Fridrich once more, for a couple of month and see if it gets better.
It should though, as I'm way more experienced with the Petrus method than the Fridrich method, and I see that the Fridrich method actually is getting me a better time now, so I should get faster seeing as I'm quite inexperienced with Fridrich (like I said, I know all the cases but I still hesitate at times due to not having practiced enough with Fridrich)
Did an average of 50:
36.30, 35.89, 38.61, 36.00, 38.91, 36.53, 38.72, 41.20, 40.21, 32.46, 38.72, 39.69, 39.86, 40.37, 33.97, 36.74, 36.00, 39.89, (41.54), 35.10, 38.11, 38.03, 30.53, 39.44, 37.75, 41.10, 30.74, 35.87, 34.35, 36.51, 36.64, 40.59, 37.09, 38.01, 38.75, 32.75, 31.12, 34.37, 34.40, 31.98, 36.98, 37.17, 39.76, 32.43, 34.13, 33.01, 34.08, 34.70, (27.97), 38.54
number of times: 50/50
best time: 27.97
worst time: 41.54
current avg5: 33.93 (σ = 0.70)
best avg5: 33.03 (σ = 0.99)
current avg12: 34.74 (σ = 2.05)
best avg12: 34.13 (σ = 1.68)
session avg: 36.54 (σ = 2.87)
session mean: 36.47
edit:
LOL! lucky avg of 12:
38.56, 34.78, 31.70, (41.51), 38.21, 26.26, 30.27, 31.52, 32.98, 34.45, 27.79, (25.10)
3 sub 30's.... :/ One day, I can't get below 40, and the other day I get sub 30's. I don't understand.