Question about monster drop items with lucky blues

[Spiritual]

So I've tried alchemy with these items quite a few times and somehow it seems the lucky actually decreases the success ratio. They fail nearly always at +2, just tried to add some +'s to a 8d Sos 2h it had 4x lucky originally and never went above +2 untill the luck blues disappeared. After they were gone it went straight to +3. Last time I tried this with a 6d shield that had 5x luck and a 7d SoS 2h with 4x, never went to +2 on either lol.

But if I add the lucky blue manually it seems to boost the success ratio. I've always thought original = manual.

[Ownage]

It is, but I have had bad luck with lucky as well, I tried to +5 a sheild on ecsro and couldn't get past +3 with lucky then lucky runs out and +5.

[Spiritual]

Well I haven't came across an item with x-amount of lucky blues already in it which would behave normally (normal = +3 with 3-6 elixirs). Soooo weird ...o.O