agree with the comments about the core ratings and needing to focus on those more, as mentioned that aejones guide has a good summary on the core ratings and recruiting priorities that newer coaches should generally adhere to pretty closely.
there's isn't a screw you factor but as was also mentioned there is a feedback mechanism in the game, if a player gets a hot hand and makes their first 8 shots for example (via good dice rolls in the engine), the engine will start correcting them down, to remove outliers like players going 0-13 or 13-13. there is definitely healthy debate about whether this is good or not, but it was added directly to counter act the randomness in the game (which was seemingly a bit higher than real life, perhaps due to the lack of human emotions which in general help round things out a bit in real life). since then complaints about unrealistic sim engine outcomes have come down. but complaints about late in the second half swings of substantial magnitude have increased.
if you are seeing this in the start of the 1st half its probably mostly luck though, or small sample size, usually the feedback doesn't have a chance to kick that hard that early.
also, if you are playing a bunch of good press teams - a good chance for lower divisions (this holds even though you are press too) - press teams tend to do better in the 2nd half, because on the whole, they tend to have more trouble with foul substitution patterns in the 1st half just because of how the engine is, and how easy it is to get a player 2 quick fouls. you may be over performing not because of anything with your team really, but the other team having even a tad of foul trouble in the 1st half can really throw them off their game. then in the 2nd half all their guys are back on the court and the expected beat down may commence?