Possibly SOGO mini Phal.? Help with care- lots of problems

[dimithar]

Hey guys!
First post here
I've had this plant for a month and a half or so. I got it at a supermarket and all it said was mini phal; medium light, medium watering It was planted in a lump of very compressed sphagum moss which was very soaked. I confess that I chose it judging by the flowers and I didn't even think to look at the roots. After I came home and read a bit I decided to repot it even though it was flowering in a bark mix. By then two buds had fallen off which I think is because of the temp changes we were having and just the general change of setting. I was thinking the bloom will be interrupted by the repotting and I'll leave the plant to grow and get stronger to be ready for the next bloom next year. Upon removing the sphagum I had to cut off three or so roots, because I had either damaged them when removing the medium or they were rotting at the tips (I do believe the overwatering was not my doing, but the store's). After repotting the plant started to develop a secondary spike and new buds which have gotten quite large by now. There are some things which worry me though:
1. The splitting of the leaves. The big one was split when I got the flower but other leaves are seeming to follow.
2.Turns out a leaf from this plant was removed, but I didn't notice that until recently. I see black areas around that (visible on one of the photos), which I fear may be rot.
3.The old spike you can see yellowing here was dark purple like the new one until two days ago.
4. I'm having a darkening and wrinkling leaf (also shown in the picture)
5.The light spots at the leaf edges- possible sunburn?
I posted this in ID, because if someone can identify the hybrid maybe they can also tell me how to take better care for it. It's been getting 'some' direct sunlight but striped by the blinds on the window and only in the afternoon (west-facing window). I've been fertilizing with a what I believe to be low strength fertilizer 4-4-7 in favor of P, which is why I don't dilute it as much, but the pant doesn't seem to mind particularly that
P.S. Size ref is in cm and I'll give any other information I have if needed.