In hindsight, had some pretty poor ADM tonight.

I won't get you fired up for an exciting story: from the outset I'll say nothing really happened, it was uneventful. ~80hr vfr ppl here. Plane got out of annual a week and a half ago. Few days ago, I got up a bit over an hour before dawn and dragged my ass 50 minutes to the podunk airport where my flying club's plane is based. Plane's been down for like seven damn weeks for annual, so I'm psyched to fly. I notice it's running kinda rough, and it almost dies when I pull it to idle while taxiing. Red flag. During the runup, one of the mags has zero drop. Well, that fucking sucks, what a huge waste of time. Got up early as hell for nothing. Park it, squawk it, couple days later get the word that it was a frayed cable and all is now well. Cool. Today. It's a super hazy day, but I'm just planning on pattern work, then the ~15nm flight over to another even MORE podunk field for gas and back, so no big deal. Hop in the plane and it fires right up, runs smooth as butter. Runup goes great with an appropriate drop on each mag. Make my call, turn onto the runway, roll to full throttle, and there's a noise coming through my headset. A rythmic TCH TCH TCH TCH TCH bit of static. I think "hm, maybe I should abort this...", but figured it was just poorly shielded wire and that's why the signal was coming through. Plus hey, who really cares if I have an electrical failure, right? It's a tiny podunk field, I just land and squawk it. Not like the engine relies on it. Everything else looked good, so off I go. The issue ended up persisting the whole flight - any time I went above 2k RPMs, loud noise. Noise continued if the radio was off, and was worse in the other seat's plugs. Got to be pretty annoying. I did three laps in the pattern, then popped over for fuel and parked it. No more drama. Well, tiny bit of drama - I also discovered that our new AV-30 shows a heading 30 degrees off of the compass. Installed during the annual. I'm a bit dubious about the mechanic's work, but I also have zero experience with any of the owner/mechanical side of aircraft ownership, so who knows, maybe this is a configuration issue or an easy fix. In hindsight, it seems monumentally stupid to have taken off and not aborted. It easily could have been some other issue, I'm not an A&P. I'd still bet it has something to do with shielding of some wire, but what if the fact the shielding wasn't there had led to an electrical fire or some other issue? What if it there was more problems with the magneto, etc? Maybe the fact that someone had taxiied behind me and was going to takeoff soon pushed me more into "go go go, get off the ground and out of their way" mode. Maybe (definitely) I just wanted to fly after not having a chance for two months, having an annoying cancelled flight, and shlepping my ass another hour trip from home. The noise only coming through my headset, and the fact the engine felt smooth as butter, led me to continue. I also need to practice aborted takeoffs pretty desperately - I don't think I've ever done one. Pretty glaring hole in my aeronautical skills. Nobody died, so everyone here will pat me on the back and say "its all good little buddy everyone's safe :\^)", but in a parallel universe, I've burned to death in a field. Why have I read so many fucking stories of people saying "damn I should have just aborted that takeoff", and yet I continued THREE LAPS then a full flight to get fuel? Fuck man. I just wanted to fly, and soon as the wheels left the ground I was having a great time. But what if? I just want our piece of shit plane to be fixed and working. Thanks for reading.