From your description, it sounds like you want gel. If you do, and doing all you are doing now, perhaps it is that you are soaping too cool? Room temperature in a house with central air set at the low 70's F (pretty common, I guess, but too cold for me, so I keep my AC set higher) is probably too cool if you let your oils & lye solution reach room temperature before you mix them.
What temperatures are you starting to mix your oils & lye solutions together? A bit warmer might be the ticket. Say in the 120 F range?
Secondly, I would go the CPOP route, as KristaY and kchaystack suggest. It works very well for me to ensure complete gel. Do you know what CPOP means? Cold Process Oven Process. When taking a long time with intricate designs, colors, swirls, etc. (or even because I generally don't like to rush) the soap can cool off a pretty quickly, so CPOP has become my routine method to ensure gel if I am not making high content milk, sugars or alcohol kinds of soaps. Even when I take a soap upstairs to the hot rooms (my AC doesn't reach the second floor nearly as well as it does the ground floor), and cover with a wool blanket, sometimes the already too cool soap does not fully gel. Usually that is a soap made with a low water content, but even so the first time it happened I was surprised that my upstairs, which I feel is pretty hot this time of year, plus a wool blanket wasn't enough to ensure complete gel.