I haven't really noticed an increase in the number of summoning signs since the game went free with gold on the 360.
I'm in the catacombs these days, have joined the Gravelord Covenant and offered as many eyes of death to Nito as I had. The Titanite Demon in the catacombs wasn't too bad, I made short work of him with Quelaag's Furysword.
After Ornstein and Smough, I thought the difficulty would ease up a little. But holy fuck at the Four Kings. For a while there I thought I'd hit a brick wall, and was afraid I'd never get further in the game. I tried summoning phantoms, Witch Beatrice, other players, what-have-you, and I could never get past the second king. I tried gold pine resin on my +5 Raw Zweihander, I tried charcoal pine resin. I tried running at them, I tried hanging back. Nothing worked.
In the end, I went solo, in hollow form, with my spiked shield on my back and Quelaag's Furysword in both my hands. Sprinted at the first king and got right up in his face. Rolled when I could, chugged estus when needed, and whacked him as hard and as quickly as I could manage. He was gone in 30 seconds or less. Next king was the same, and the third was even easier. I even had enough time to head off and collect my souls from a previous death in between the third and fourth king as I was ahead of schedule. Then, I hit up some Iron Flesh and fucked that motherfucker so hard. Christ, it felt good. No other game has given me so much elation (and despair).
This is the best game of the generation for me. If Beast's Souls turns out for the better, I'll have to pick up a PS4. I'll have no choice.