I spoke to Ecothrive- firstly what a lovely couple that run it. Super helpful and clearly have experience. For us smaller growers in smaller pots, mixing the life cycle in with a lite mix will actually make it more like All Mix. The smaller pots work fine but will not last the life of the plant. So after about 4 weeks i will need to use nutes like Bio Biz and/or top dress with Life Cycle. When mixing up the life-cycle into the lite mix, with 50litres of lite and life cycle, if you can keep it all in one then the warming/cooling of the soil should be done in a week or so. If you are mixing it straight into the 13 litre pots, then it can be used more or less straight away as the soil won't warm and cool in same way. Basically bigger pots is ideal as the nutrient is available for longer and the bigger the mix, the more the warming and cooling will be (he did use a technical term for the warming but i didn't make a note of it... something thermal). Hope this helps someone else.
I am going to give it a go. My hunch is to mix most of my lite mix, but keep some back, fill my pots with the mix but not to the top, then top up with plain lite mix and plant seeds straight in. This last bit is all my own idea and if you could see my grows you will know my ideas are not usually the best. But i like to try around. Then i will switch to bio bizz nutes when i am about 4 weeks in/ flowering (cos i have some) and see how it goes.