So judging and scoring is subjective, I think we have all heard that before, and the term HIT is extremely misleading, a hit routine typically only refers to a routine that doesn't have any deductions or missed skills. The truth though is if you do everything real well, with excellent execution, synchonization and cleanliness and have properly maxed out your score sheet then you can overcome a stunt fall, bobble or tumbling issue and beat a HIT routine that score lower in the execution or difficulty category. I suggest becoming familiar with the Varsity Scoring Rubric.
http://admin.varsity.com/uploads/editor/files/PDFS/AllStar/16-17-VAS-Scoring-Rubric.pdf and the Varsity Score Sheet:
http://register.varsity.com/VAS/16-VAS-score-sheet.PDF . As for the variance, I think it is way too simple to just say judging is subjective, there are many factors that can go into how a routine is scored that is separate of the judge themselves, they can be seated at a different height or angle that allows or doesn't allow for the same view of a routine at every venue, and leads to sometime something being seen in the back of a routine that might get missed in another competition. With that being said, it is likely that your execution is getting graded in the most or majority range at one competition and the next one you might be getting put in the lower majority range or the less the majority range. On top of that they have a range that they can grade your difficulty, as an example a maxed out score sheet routine could score between 4.5-50 for each stunts, pyramid, standing and running tumbling, at one competition you can receive 4.9 for difficulty in all 4 categories and in the next competition it could be graded a 4.6 in each category. That alone could be a difference of 1.2 points, before you get in to what the difference in execution scores for each category could be.
Here's an example of how a 4-5 point variance might work:
Competiton 1(diff/exec) Stunts 4.9/4.5 Stunt Creat 4.6/0 COED 5.0/0 Pyramid 4.9/4.5 Pyramid creat 4.6 Toss 5.0/4.5 St Tumbling 4.8/4.6 RuTumbling 4.7/4.5 Jumps 5.0/4.6 Dance 4.7 Perf 9,6 Rou Comp 9.6 total= 94.6
Comp 2(diff/exec) Stunts 4.6/4.3 Stunt Creat 4.3/0 COED 5.0/0 Pyramid 4.6/4.3 Pyramid creat 4.3 Toss 5.0/4.3 St Tumbling 4.5/4.3 RuTumbling 4.5/4.3 Jumps 5.0/4.2 Dance 4.5 Perf 9,3 Rou Comp 9.3 total= 90.6
Difference is 4 points.
Maybe at competition one legs were straighter and in secquence, and
stunts and body positions are performed more cleanly than at competition 2. tTey are both the same HIT routine.