The problem with recipes is that they can’t account for all the variables involved with the ingredients you choose to use. Adding acid blend, for example, is typically done to correct a must that is not acidic enough. Without knowing how acidic your pineapple juice is, you have to assume your ingredients are the same as the author’s. If you plan to do more “from scratch” fruit wine, you might find even an inexpensive pH meter a very valuable tool. Also with the sugar. You add enough to get your starting SG to match the amount of alcohol you want in the finished wine, not necessarily what the recipe calls for.
The yeast you use also plays an important roll. I found this about your yeast:
This yeast will produce hydrogen sulfide gas in the presence of excess sulfur compounds and therefore should not be used to ferment grapes that contain residual sulfur dust. Temperature range: 59-86 F. Alcohol Tolerance: 13%.
As a beginner, I would stick to a very tolerant workhorse such as EC-1118. Too much sugar or acid can both stress yeast.
Something I do is keep a log book, and make copious notes about everything I do. It is invaluable when making future batches to know what problems I faced and how I fixed them. It also gives me a source of information when asking for help. I always, always record my starting SG, and also at every step, as this is critical information when asking for help. Advice is often very dependent on how far along you are in your fermentation.
I know that’s no help now, so what is your current SG? As a beginner, if you’re not confident of your reading, feel free to post a picture. Also, are you fermenting in an open primary, or an air-locked carboy? A lot of beginners make the mistake of doing primary fermentation in a carboy thinking oxygen is bad, where in fact yeast needs oxygen to multiply. Lack of oxygen can also stress the yeast.