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I appreciate the effort you're investing in this project, Dave! It's nice to see you here.Update Table. Small reduction in HP and DPR and added XP column since that is different too (OP has been updated):
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You've probably done this a ton, but I thought I'd evaluate some classic monsters with your matrix... At first blush looks like there's big differences in the XP awards for monsters between what the MM says and your method?
Kobold (CR 1/8, XP 25; prof +2, AC 12, hp 5, atk +4, dmg 4) = Level 1 (XP 100)
Orc (CR 1/2, XP 100; prof +2, AC 13, hp 15, atk +5, dmg 9) = Level 2 (XP 200)
Bugbear (CR 1, XP 200; prof +2, AC 16, hp 27, atk +4, dmg =11+7/3=13) = Level 3 (1,350 XP)
Note: I think it's meant to follow similar bump ups/downs as DMG page 274? Except that since there's no offensive/defensive CR calculation, the starting point on your table is sort of an "average" of Hit Points and Damage? For example, this puts the Bugbear between Level 3 (dmg) and Level 4 (hp). Its AC 16 is two points higher than 14, so it's bumped to Level 4, but then its Attack bonus is only +4, so it's bumped back down to Level 3. Is that using your matrix correctly?
Ogre (CR 2, XP 450; prof +2, AC 11, hp 59, atk +6, dmg 13) = Level 4 (2,000 XP)
Note: 59 HP indicates Level 8, while 13 dmg indicates Level 3, so the ogre starts between Levels 5 & 6. Its AC 11 bumps it down two steps to Level 3 or 4. Knowing the ogre is tougher than a bugbear, I estimate its maybe Level 4.
Displacer Beast (CR 3, XP 700; prof +2, AC 13+4 displacement=17, hp 85, atk +6, dmg 22) = Level 6 (3,300 XP)
Note: 85 hp is level 11, while 22 dmg is level 5, so it starts at Level 8 but its proficiency bonus is low - not sure how that affects following the matrix, so I'm assuming that bumps it down one step to Level 7. Then it gets bumped down one more step for its Attack Bonus +6 being two less than +8, which makes it Level 6 maybe.
Troll (CR 5, XP 1,500; prof +3, AC 15, hp 84+(3*10)=114, atk +7, dmg 29) = Level 8 (4,600 XP)
Note: 114 hp is level 14, while 29 damage is level 6, so the troll starts at Level 10. However, its AC bumps it down one step to Level 9, and its Attack Bonus bumps it down one more step to Level 8. I think.
Am I understanding how your system would interpret these existing monsters correctly? And IF I am (big IF), what accounts for the XP difference?