Don't get hung up on the water temps, bottom line is the more Oxygen the roots receive, the better.
A DWC system (like the one in this thread) is great for propagation. The dual container is great for veg. IMHO This is the best way to grow flowers.
Aeroponics systems, supplies and information.
DWC is short for Deep Water Culture. Any system where the roots hang in deep water is a DWC system.
Don't get hung up on the water and nutrient supply. That is never an issue (even with soil). Usually the problem is giving too much water and nutrients. Everyone has stories about over watering or over fertilizing their plants when they first started.
Plants create sugar to grow (I know, duh). Basically they need Carbon, Hydrogen and Oxygen. This added with light, Chlorophyll and small amounts of trace elements, gives them sugar. The plant gets it carbon from the air through the leaves. The hydrogen comes from the water through the roots. The oxygen comes from the air through the roots.
So think about this for a second. If the plants can get all the hydrogen (water) and nutrients it needs easily, then the limiting factors for growth are elsewhere. You have to look at carbon, light and oxygen. The only way to add more carbon is with CO2 emitter system. Light is obvious. The Oxygen is what people get confused about. The O2 is absorbed through the roots. The more time the roots hang in air the more O2 they can absorb. You have to look at if differently. How can give the roots the maximum amount of air without the roots drying out. You spray them just often enough to keep the roots moist. With no other limiting factors the plants will grow at their maximum potential.
At the same time light might be a limiting factor. You may have to double your light output to really see a large improvement. A CO2 system may also be required to see massive gains. If you're running a small light without much ventilation, all the best hydro systems systems in the world won't help you.
Many different hydro setups allow a time period of no water flow (NFT, ebb & flow). They do this to allow the roots max O2. When your roots hang in water they never get as much O2 as when they hang in air.
Try the double container setup. Use a pump timer set to 30sec. on and 5min. off. You may need to add more light or CO2 to see a big difference but when everything is dialed in your babies will freak!
Peace!