From my experience, then is just wait--i know how painful it is to sit and watch/wait. It's important to wait for at least first membrane pip because the membrane still has blood vessels sending blood to the chick. The last hours before hatch, the chicks body is absorbing the yolk from the yolk sac and blood from the vessels. So, the shell needs to stay in tact to protect everything on the inside.
When the chick pips the membrane, it's got energy from the absorbing yolk and blood (both of which are still being absorbed). The first movements triggered are in the neck (muscles twitch). The head is actually tucked under the left wing, and the pip usually occurs along the air cell line, from the armpit area. So, if you look closely along the air cell line... And, what's your humidity? It should be at 75% now. Can you upload a picture of your egg in the incubator?