Here the last update changelog, apparently all guard gauge values are fixed, the perfect version of the game is apparently here:
Street Fighter Alpha 3 Upper
Added the Additional Characters setting to EX Settings.
About Additional Characters
When this option is On, the additional characters Eagle, Maki, Yun, and Ingrid will be available.
Note: Additional characters will be disabled for casual and ranked matches.
Training Mode
Training Menu > Dummy Behavior
- Added the settings Damage Reduction and Timing Guard.
- Added the following five options to the Recovery setting.
Midair Recovery (neutral), Midair Recovery (forward), Midair Recovery (backward), Ground Recovery (close), Ground Recovery (far)
Training Menu > Dummy Settings
- Added the Fixed 100% option to the Super Combo Gauge setting.
- Added the Mode Select setting to EX Settings.
Available options are On, Off, and Original. When this option is On, mode selection is possible on the character select screen.
About Mode Select
When this option is On, a mode select menu appears on the character select screen.
Available modes are NORMAL, MAZI, SAIKYO, and CLASSIC.
MAZI
• The amount of damage you deal and receive are increased.
• In addition, you lose the match if your opponent wins a single round.
SAIKYO
• Your Guard Power gauge is shortened, and you are easier to stun.
• However, the score you earn is increased.
CLASSIC
• This mode makes the game similar to Street Fighter 2.Super Combos, air guard, and recoveries cannot be used, and the Guard
• Power gauge is disabled.
Note: These modes cannot be used in casual or ranked matches.
Training Menu > Dummy Settings
- Added the Fixed 100% option to the Super Combo Gauge setting.Training Menu > Dummy Settings
- Added the Fixed 100% option to the Guts Gauge setting.