Cattleya black new Leaf tips

[braxtonds]

I have a Blc. Orange Nugget x C. lawrenceana 'Blushing' orchid growing in a 6" clay pot with coco/bark mix that is 1/3-1/2 filled with a net pot/lava rock on the bottom for drainage. I tended to overwater in the past so I tried for this drier combination this time when I repotted this past spring.

Here is the plant:


I haven't had any major issues at all with this plant until this year. Most if not all the new growths have developed black tips. They seem to dry up and prevent the new leaf from opening. The new growth can be seen because they are more purple/red than the old growths.





In addition, a few large black spots have occurred and appear to go right through the entire leaf. I keep my entire collection outside all summer, under the porch roof (no rain water.) I water either from hose or excess pond water so the water can set on the leaves but tends to be mostly dry by night since I try to water in the morning or midday. I live in Ohio so the nights are colder.

Any ideas would be greatly appreciated. Thanks.