Mary,
From your picture, it looks like your truffles are square. This will make it much easier (and quicker) to precoat them. There are two ways you could pre-bottom your truffles.
1. spread your chocolate out before putting your ganache frames down and pouring your ganache. thus once your ganache sets, and you cut it, you'll already have a very smooth bottom.
2. pour your ganache into your frame & when you are about ready to dip, coat the top of the ganache, let the chocolate set a bit, & then flip it over & cut it. I prefer this method because you can cut the chocolate before it fully sets. This helps prevent the chocolate from cracking when you cut it.
Our centers are very softso pre-coating the bottom prevents the center from sinking into the dipping fork and thus sliding off much easier.
To get the truffle off the fork, i like to keep the fork warm in the chocolate (this prevents the chocolate from setting to the cold tines of the fork). Also, I like to dip with tip of the fork thus the truffle only needs to slide a short distance.
Also, once the truffle is sliding off the tip, I'll set the front end on the paper & push my fork down to break the tension and slide it out more easily. This sounds peculiar - If the truffle and fork are at a 45 degree angle, i'll set the tip of the truffle on the paper & push the tip of the fork to say 35 degrees and thus the fork pulls away from the truffle and it is easier to slide the fork out.
Then, we'll slide the fork out a bit & push the center back onto the foot. This helps minimize any feet.
Then lay the fork flat& pull it out.
I hope this helps.