Hey Dawido, sorry man but i only have a "bad" answer for you. Basically the genetics are sensitive to heat, so they are slow from the heat, and if you want to get optimal growth you need to reduce the heat somehow, maybe with a bigger exhaust maybe with a bigger fan. The hard part with the heat is the grow room heat, but the easy part with the heat is the solution temperature heat, try getting it down to 21, at least it s something easy to do which will be effective. if you cant get the grow room heat down, try getting the root zone heat down, as long as the roots stay cool or cold then the plant will think it's cold enough. more airflow helps... or an AC/AirCon... bad answer, but it's the truth at least ! hope this helps my friend ! 🚀