Carefully check the specs of the 4 wrap 0.26 ohm wires against these and you will find they have totally different core wires, they both have a clapton outer wrap and made from Ni80 but it doesn't make them the same. The ohms per foot/metre is different for each wire

If you unwind a wrap the leg will become ridiculously long as you will be forced to clip a relatively long length from it or it will not fit in the tank - this WILL lower the resistance.

Don't take my word, or anyone else's - either check Steamengine, or put a coil in any tank you have, check the resistance - then remove it, unwind a wrap, re-insert and re-check. The resistance will drop because you are using a shorter length of the same resistance wire if you take a wrap off the coil