Actually, half of the point of this growth is securing good clones for the autumn. Apart from that, I already follow most of your tips, windows wide open at all times, I open the front door for a few minutes several times a day to exhaust the house with a draught, etc.
But we're hitting over 30c outdoors now, so any serious attempts at growing right now are thwarted (can't fit an AC in the room)

Thanks for the tips

Any idea of how these will turn out?