As for your question, ive never had an issue with going from small amounts of nutes to increased strength, as the plants grow they will need/use more. I dont really get why you would need stations? Do you have multiple plants at different stages?

I only use two different areas for growing, the first i start indoors under MH lights under little nutrients, then i up the the dose a little stronger (i use teh same nutrient res), next i move them outside at full strength. Four stations seems like a lot of work

What size pipe is that? they seem kinda close for toms, and in 4 inch pipe i couldnt grow them, litterally the roots took up the whole pipe and blocked it until water couldnt pass. I use 4 inch for peppers and it works well.

yeh I have some plants at germination stage, some seedlings and some almost ready to move into a bigger system.

the last seedlings I added nutrients too ended up dead by the next morning and my TDS was only 300. could have been something else I'm not sure.

the pipes are 4", it was the largest they had at Lowes and since this is en experimental system I used them. When I get a greenhouse up and running I'll probably do a drip system with coir slabs for the tomatoes.

Have you checked on the pH level? How about the lighting source? Building different stations for your seedlings to determine what nutrient level should suit the system that you are using may seem to help you with your concern, after all, experimenting different options in hydroponics will make you more experienced with the method...:)