cucumbers shriveling...

[Agraco]

I need some help to focus my efforts with respect to cucumbers. I was following the advice of my local weed store but when I realized that the advice was contradicting itself, I realized I needed a different approach.

Step 1:
• Superman B1: 1-2-1
• Calcium / Madnesium: 2.3-0-0

Step 2: once the plants are growing well and about to flower, I should do the following:
• Gigaboost: 0-3-3
• Optical (Calcium / Magnesium): 2.3-0-0

Result
• The plants did indeed flower quite fast, but then from the bottom up everything started to yellow and dry.
• I ended up with 1 cucumber for each of my two plants. So at least I am consistent.
• When I went back to the store, I was told that I must have surely misunderstood the previous salesperson because “Gigaboost” is the wrong way to grow cucumbers. (I bought what I was given).

Current status with new crop:
Still at Step 1. The stem is about 12 inches. The link below shows the following pictures:
1. The different nutrients I am using
2. The type of cucumber seed
3. growing medium (mix of rock wool and rocks)

What do I do next?

thank you very much!