That would only matter if you put the same team on the same number and put the same number on the same ball in every draw and used the same balls for every draw (and given the minuscule differences, it would have to be thousands or even millions of draws to make a difference).
Back in reality.. different balls are used and different teams are assigned to different numbers in different draws. That in itself is not random, but it does negate any size/weight/etc difference across draws, because the person making the draw cannot know which team is which from year to year (one year we'll be the pea, and the next a tennis ball).
Unless you're suggesting a conspiracy? Which I'd be fully on board with if we'd got away so many consecutive away draws

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