Hi. We have just laid some engineered wood flooring (5g glueless) by floating it over a concrete base, with some 5mm underlay. The base was pretty terrible in terms of it being uneven, so we had a guy come and self level it in 2 lots. The floor still wasn't perfect but the guy said it should be okay. After the self levelling was done, I applied a liquid dpm in prep for the laying of the flooring. To be honest, wish we hadn't listened to the guy as since laying the floor, there's a fair amount of bounce. I know I should probably wait a bit longer to see if the floor settles but I feel like the base is the problem. If it doesn't settle and as the flooring is glueless, I am seriously considering taking it back up, lifting the underlay and then trying to level the remaining problem spots. The question is, what sort of stuff should I look to use to patch the uneven spots, rather than try and level the whole floor again? Also, I understand that I'd need to use sand to get it to bond to the floor as there's a liquid dpm in place? Many thanks in advance.