I agree, the 43-101 low tonnage of DE1 is the major reason for the low SP. For any nickel camp in a new and remote area you need tonnage to make it economic. If you look at Canada, they are all in the 100 million tonnes plus range(Sudbury, Thompson, Ragland, Voisey's Bay). You need tonnage for two reasons: To have high output and to be able to operate for decades. There are tons of studies and investments in setting up such a camp making it a long and time consuming process, you don't just pay that off over night
As others have also indicated, I would prefer NOT to focus on deeper drilling and extend the deposits. Thats what will make a difference, not finding others, that's more or less for granted and is probably already reflected in the SP.