I haven't much hope of getting much feedback on this as everything Deathwatch on here seems to be 4+ years old, but a group of friends of mine are looking to start a game of it and I've been checking out the sheet to see how it works, and most everything seems fine, but it does seem as though the sheet is calculating strength and toughness bonuses at a x4 for melee weapon damage and armor and defense instead of the x2 that it should be for the Unnatural Strength and Toughness bonus for space marines. Can always turn off the auto calculation and input it manually for weapon damage and just remember the actual value for armor and defense, but if the sheet author could look into it that'd be swell. Or perhaps if someone would like to give some advice in how I could attempt to fix it myself, would be equally great.
