best boiled eggs i've done have been via pressure cooker.
cup of water in the bottom, eggs on a steamer rack. cook for 6 or 7 min once up to pressure. quick pressure release and then into ice water.
shells come off easy and yolks are done w/o any gray.
for deviled, do the above, then cut eggs in half and pop the yolks out, mix with vinegar, mustard and mayo and return to divots in the whites. top with paprika and a jalapeno slice and you'll never have any left over.