Without wishing to be critical, that's the wrong way to establish your saddle height. If you want to touch the floor, get off the saddle. The correct saddle height is a distance measured between your saddle and the pedal, when at the furthest point from it...
The problem with that is that I wouldn't be able to touch the floor! That's too scary. lol.
I've been to the LBS this morning and they made a few suggestions - one being that I train myself out of the bad habit of scooching so far back to go up hills! The other was to either try a longer stem or to replace the seat post with one that will allow me to move the seat a couple of cm further back. Both suggestions will cost me £20 -£30 And I will have to wait for the part as the only stem they had in stock was black and my bars are shiny silver, and that's so not a good look for me.