You've got two separate issues wrapped up in your post... better to look at them separately.
First, ballistics. Your drop chart is something you should have absolutely dialed in and that you've verified and confirmed on the range before the match. You need to run with either DA from a kestrel or with location/weather specific variables that you put into your balllistic app. I do both, Kestrel to measure DA at the range to run in my ballistic app, plus I'll build a hard copy drop chart in advance the day before the match. JBM Ballistics to calculate the chart (
http://www.jbmballistics.com/cgi-bin/jbmtraj_simp-5.1.cgi), I get the physical elevation of the match site by going to this website (
https://www.daftlogic.com/sandbox-google-maps-find-altitude.htm) and pull weather forecast data so I know what the baro pressure plus projected temps throughout the day are. That way I've got a physical backup if my kestrel dies or electronics have issues. The key is making sure your environmental data is solid, both at the time you are gathering ballistics at home and when you are off shooting a match. Big picture though, the temp change probably wasn't your issue at the match, it only matters out at the really far targets (ie 1000 yards) and even if it warmed up 20 degrees that's probably only 0.1 or 0.2 mils of elevation.
Second is wind and I suspect that was the real issue at the match. Don't worry, the wind kicks everyone's butt. Kestrel is handy for getting a wind speed at your location so you can put that in your app to get a preliminary wind hold estimate. However you also need to look down range at all the indicators plus have a big picture sense of how the wind is interacting with the terrain and ebbing/flowing. This can all help you make an initial wind call. Have mental preparations for high/low estimates on wind so you know how much to expect to hold if the wind is picking up or dying off. Have mental preparation for the changes in wind hold for each target from near to far within a stage. For example, if you are getting hits with a 1.2 mil hold at 600 yards and the next target is 850 yards, know what the wind hold should be for the next target based on what you were just doing at the last target. Hold wind in the reticle, don't dial for wind. Make clean trigger breaks and know where the reticle was when the shot broke. Did you miss left because of wind, or did you miss left because of wobble? You want to correct for one, but not the other. Keep your gun consistently level when shooting, inconsistent leveling in the gun will move the bullet left/right, making it harder to know exactly what was the effect of the wind. Finally, and above all else....
spot your impacts and misses. If you don't see where that bullet landed, you don't have any feedback on what you need to do for the next shot.
