After 2 weeks on the heating pad, it looks like germination is going well. I dug up a small batch from one of the flats to see what was going on and it looks like in this sample at least we have 1/3 with roots, 1/3 starting to crack open or showing a tiny point of a root about to come out and 1/3 that are still firm but showing no signs of germination.
Now I just need to get my root pruning bed built this weekend so I can plant all these in there soon.