Ovinomancer
No flips for you!
Actor is quite powerful in the right campaign, even moreso than GWM. Those options are there not because they represent the ability to pick lesser or greater choices in the absolute, but because they offer different options to fit different game focuses. The suggestion you're making is a straight power increase -- it's always better to get the higher tier options. At that point, being able to choose a lower tier option doesn't address balance at all.It's not a feat chain, though. It's OPTIONS.Just like you can spend a feat on GWM or you can spend it on Actor another less powerful feat.
Here's a toy example: you can take feat 1 and get either ray of frost or firebolt. Taking feat 1 is the only way to qualify for feat 2. Feat two either gives you the other ability of feat 1 (the one you didn't select) OR it allows you to cast Wish once per day. The option to select the lower tier option doesn't address the fact that feat 2 is vastly more powerful. Otherwise I could balance any option by just allowing you to take a lesser, weaker choice, if you wanted to. That's not balance, it's lipstick.