Here is what I would do. Skip the rehydration step it is just another step to introduce contamination, you can add it back after you find the cause. Try starsan for a couple batches. This will force you to change your procedure and you might notice the problem. You may consider getting new...
We plan to add the sample port very soon. It is terrible not being able to check the batches progress.
The immersion chilling we are planning is something along these lines. https://www.youtube.com/watch?v=s_E6al8IF34&index=20&list=PLA26BAD8222533B9B
I ordered a 100gal SS drum from bubbas barrels for the boil kettle and a 55gal SS drum as a mash tun, and use a 55gal plastic for a temporary HLT. The plan is to upgrade this to have another 55gal SS drum as a second mash tun and another 100gal SS drum as HLT combine the two mash tuns into the...
I just brewed my first batch at my nano weekend before last. We are using two 110gallon plastic conicals. (http://www.ntotank.com/110gafudrcob.html) Shipped to my door they were about $900. Then I added wheels for another $50 each. You could ferment about 2.5bbl in each. If you were to brew...