Try a different seed supply or method. 10/110 is pretty low.
I had good success with Koehres Cactus (avg 50% germination +) and
Pavel Pavlicek seed (avg (65%+) - although Pavlicek is a bitch to
order through because he just refuses to get with the times (online
ordering) to overcome the language barrier. As of this date he still
refuses to send me my last order of about $30, claiming it was an
amount outstanding - Bull*#@t! but whatever his seeds are fantastic.
The problem is he uses this whole "send your order with money" idea.
Worked well the 1st time... but that was it and I got burned after
Also my best heat source was placing the whole (plastic impermeable)
container on top of my computer monitor's back, where the seed tray
got warmed just perfectly at good intervals. These changes in temp.
really stimulate germination.