Never tried the egg candles but have worked with many other silicone moulds, they all need topping up as the wax shrinks when it cools. I let them fully cool then trim the wick level with the top of the mould and then fill in the shrinkage and let it cool a bit till its solid but still a bit pliable. Then I open the mould and take the candle out and put it on the counter to harden further, doing it that way you get a nice flat bottom to your candle and it doesnt need any further timming to make it stand firm.