That sweater -- again

Here's the sweater! I used a pattern generated by sweatermaker software, based on C's measurements and my gauge swatch. She's turning 4, but she'already a little bigger than a standard size 6.
She chose the main brown color and the rusty orange from my stash. I could see I would not have enough of the orange to do much, so I added the white and ripped back the gauge swatch I had of the dark yellow, so there's just a couple of yards of that yarn left. Even then, after knitting the sleeves, I could see that I wasn't going to have enough of the yellow and orange for stripes on the body section. So, I made a pocket.
The sleeves, following the pattern instructions, were too short, so I lengthened them and I lengthened the body a little. I have plenty of that chestnut purée colored yarn. Once I sewed everything up, it looks to me that the yoke is too short, that there isn't enough armhole.
Following the pattern, I knit the two yoke pieces, first, sewed up one seam, and did the neck ribbing. I followed the instructions, but the folded neck was too tight, so I undid the cast off and sewed it shut. Then, sewed the second seam. I put the required stitches from each yoke back onto the machine to knit the first sleeve, from the top, down. And the second one. I had to be extra careful to get the stripes in order -- opposite from the order on the yoke, which was knitted from the bottom, up.
This is exactly where I got to the first time. It went faster because I remembered what I was doing. I was very careful to have the right number of stitches on the yokes. Then it was time to put the body stitches on - front or back, didn't matter. I ran into the same problem as before. The yoke circumference would not stretch enough over the straight needle bed. I had to put the stitches onto a needle and hand knit several rows. I did 17 rows, in all. It was still a tight fit onto the machine, but workable and the rest of the was fine, finished in the time it took to cook the vegetables (about 10 minutes). That was the back. Before repeating for the front, I had to create the pocket so it would be ready to integrate into the front -- and the first time I did that, it was backwards. Again, I'm not used to thinking Top-Down. I had to rip out about 10 rows and put it back on the right way. Just before doing the ribbing, I had to put the bottom of the pocket on the needles, but I forgot. I had to rip out the ribbing and start that bit over.
With all this ripping out and doing over, it took five sessions over two days to do. A much faster feat than had I hand knitted the whole thing. Now comes the test. Will it fit. Especially, will it fit in the Fall and winter. If the yoke is too short, I can unknit a row and add a few extra brown rows and graft it back together by hand.
Can I trust this software to churn out the patterns correctly, or will I have to constantly correct them?