Exactly, once you dial in a depth, a certain structure, a bait, etc. repeat it. Sometimes you'll get fish shallow with the setup just below the ice and other times it's deeper and just up off bottom. I've heard guys say a dead minnow laying on bottom produces really well too when chasing pike. I think most will tell you eyes are by far and away most cooperative just before and after sunset, don't hear a lot about a morning bite or mid afternoon bite. Most lakes I think you'd be wasting your time chasing perch on tip ups but I know some are worth it that are known to have bigger fish. If I were after perch though I'd rather be chasing the schools and hole hopping rather than leaving a bait in a hole for hours at a time. Seems like if you were getting an occasional one on a tip up it would be better to just jig the hole actively. But like you said, any tip up, working properly should let the line spool out freely. Some have tension settings that can be adjusted and that would be more important with light biters than others. I know mine have different settings to pin the flag down making it easier or harder to trip it but once a tip up is tripped it should freespool as easy as possible.