Actually, what we allowed was Practiced Spellcaster was applied last so only came into effect if you rolled less than 3. It looked like a good compromise.
As for Wild Mage increasing the random variables of spells. It doesn't. It means you cast the spells with random levels of power behind them. The random variables are defined inside the spell and Wild Mage does nothing to the spell description to introduce more random effect. It increases the expected variation of a casting but not the variability of the spell. See the difference?
If you want to run it that way, that's cool.
But that's not how it reads. RAW is RAW. you might feel it's different. You might have different house rules that lead you conclude things a certain way. But wild mage changes the SPELL. Empower and Maximize affect random values as the spell is cast, not as it's memorized.
Does Wild Mage Change the spellcaster or the spell?
I claim the spell. YOU claim the spellcaster. My claim is based on it states SPELL in the PrC Class feature and not Spellcaster.
PHB Glossary:
caster level: A measure of the power with which a spellcaster casts a spell. Generally, a spell’s caster level is the spellcaster’s class level.
Caster level doesn't even exist until you cast something. It's determined as you cast a spell. GENERALLY it is equal to your class level. It could be all sorts of numbers, but that's usually what it is. In this case, the number is random.
Wild mage Class ability is quite clear, it modifies the CL of a Spell.
Now, if you are telling me, and can prove, that Caster Level is NOT a numerical value of all spells, then I will conceed that it cannot be made into a variable value, and therefore, is not subject to empower or maximize.
Now, again, I can see how close it can appear that Practiced spellcaster should work for this. But then I have to ask, If I get hit with a penalty to my caster level, say, a curse of -6 to CL, would practiced spellcaster work against that?
I'm saying no.
However, even if you can't benefit from the full bonus immediately, if you later gain Hit Dice in levels of nonspellcasting classes, you might be able to apply the rest of the bonus.
Once you take the feat, its DONE. It will change only, and ONLY when you gain more HD. It does NOT change every time your CL changes. The -3 to your caster level is ONLY when casting spells, not ALL the time. I know that seems illogical, but lets say you were doing something involving your caster level, but it had nothing to do with spells. Say, crafting a magic item that required no spells, just craft arms and armor, for example.
Your CL is not -3. Your CL is your Arcane Caster levels. So if I'm a 9th level wild mage crafting a +3 sword, I can do it, because I meet the CL requirement. By YOUR view, I could only craft a +2 Sword, because my CL is -3.