Well, I decided to take some measurements, like u said, maybe the CP boots are not for me, cause there is no perfect size, since they dont do halfs... anyway, I measured the insole, which is what matters... the 43 has 28 cms more less, which is about 11 inches... a nike us10 has the same, louboutin 43 also the same and the SLP boots 43, also 28 cms... so Im kinda reliefed, is just that the CP toes are really weird lol cause the fit on me is ok I guess, I think a 42 would smash my toes and the 43 has some little room on the front, but in general the boots are actually hard to put on and my feet doesnt move inside or while I walk!I think it depends on which part of the shoe you're seeking room in. You have a ton of room in front of your toes, so length-wise you should def go down to 42. However, if your foot is maxed out in width, just this shoe shape may not be for you and can check out other chelsea boots for a better fit.
Comparing to other brands, especially SLP is kinda useless unless you know how other sized in between those exact models. Their shoe shapes are just so different. From what understand, SLP fits very true to size, whereas CPs can vary, with the chelsea boots fitting large. For example, I wear a 43 in CP Achilles and Chelsea, and 44 in bballs and others. I have a medium width, maybe slightly narrow foot, so the length really works for me. For example, I wear a 11 in Nike, and 10.5 in other dress shoes and boots.
Thanks for the replies tho