Give this a try and please discuss what your thoughts are about it:
Step One: During combat the attacker compares their Agility Rank to that of the defender:
If the difference is within one rank then there is no modifier.
If the attacker's agility is two ranks lower than the defender's agility then the attack modifier is -2CS.
If the attacker's agility is three ranks lower than the defender's agilty then the attack modifier is -4CS.
If the attacker's agiliity is four or worse ranks lower than the defender's agiltiy then the attack modifier is -6CS.
An attacker does not gain bonuses if their Agility Rank is greater than the defender's Agility Rank.
Step Two: Apply the modifier to the ability that the attacker is using to execute their attack FEAT.
EXAMPLES:
Slugfest or Ranged:
Ax Saxon has Amazing Fighting and Excellent Agility. His nemesis, Lord Abbaddon, has Amazing Agility.
The Reflex Ratio is determined by noting that there is a 3 column difference between Excellent and Amazing. Therefore, Ax Saxon takes a -4CS to his Fighting Rank when attacking Lord Abbaddon. This drops his FEAT roll to Good
If Ax were throwing his battle axe at Abbaddon, then his Excellent chance for the agilty based attack would drop -4CS dropping his chance to Feeble.
Charging:
Magnificent Mullah has Incredible Endurance and Typical Agility. She is going to charge attack her foe Mastadon who has Excellent Agilty. Mullah is two areas away from Mastadon.
MM gets +2CS to her Endurance attack due to the movement bonus (+1CS per area moved through maximum +3CS), however, the Reflex Ratio knocks her back down -2CS because her Agility Rank is two ranks lower than Mastadon's agility.
To complicate matters, Mastadon will dodge. The FEAT roll comes up Yellow. Therefore, Mullah's Endurance based attack drops another 4CS to Good.
Grapple or Grab:
Brickhouse has Monstrous Strength and Good Agility. In addition to her natural ability she has the Wrestling Talent and Martial Arts B. This combo gives her +3CS to her Strength attack. That makes her a wrestler with Shift-Y ability. However, Grappling attacks in the MSH RPG require a Yellow FEAT to succeed.
Her enemy is Zig Zag who has Monstrous Agility. The Reflex Ratio drops her Yellow Shift-Y chance to a Yellow Remarkable chance.
NEGATIVE SHIFTING (shifting below Shift Zero):
As far as shifting below Shift Zero, I advise a dramatically drastic penalty system. If the modifier(s) cause the attack to shift just one column past Shift Zero, then the attacker can only succeed with a Yellow Shift Zero FEAT. The color result is what it is; if the only way the attacker could hit was with a Yellow result then the appropriate potential Battle Efect is applied.
If the modifier(s) cause the attack to shift two or more column shifts below Shift Zero, then the attacker can only succeed with a Red Shift Zero FEAT. As with a Yellow result, the Battle Effects table could come into play.
These ideas would make it much more difficult for common or low level attackers succeed in hitting major characters, hero or villian.
For instance, a street thug with Typical Agility shooting at Spider-Man would no longer have a 50/50 chance at shooting Webhead. The Reflex Ratio and Negative Shifting Ideas drop that thug's chance from Typical to Red Shift Zero.
Thank you for your time,
Secret Defender