How tall are you if I may ask?
Adding a plug should decrease the flex of the sticks right? I know also that Junior sticks have smaller shaft diameters and blades; does that affect noticeably affect your game?
I'm 5'5 180lbs.
How much the length affects the flex with juniors is weird. Zero consistency, so the only thing I have to go on is feel. With CCM sticks, the markings say each inch equals 1 flex. The Bauer markings say each inch is like 3.5 flex. I added 4 inches to my 1X and it does not feel like a 36 flex. All my sticks are the same length and are supposed to be stock 50 flex, but my Warrior with a two inch plug plays way softer than my 1X with a 4 inch plug.
As for how junior dimensions affect my game, shaft dimensions didn't require any adjustments. I have small hands. And to battle issues with durability, I just put strips of hockey tape over bottom part of the shaft protecting the slash zone from chips. Haven't broken a stick yet. I play center and face a decent amount of slashing.
As for blade, it depends on the individual stick. There are large junior blades and smaller ones. The larger ones are only about 1cm shorter in length and width, at least with the P92 curve. I started off using those. Didn't take long to adjust to that, but the shorter blades took a bit more of adjustment. But now that I'm used to it. My game is basically the same as it was before. In fact, I find I can use a wider range of sticks and not have to even think when I switch between them.
The biggest adjustment is with blade softness. Some brand's blades are stiffer while others are softer. Warrior blades tend to be a little soft, so sometimes if the other center is observant, they know they can power through my blade during a face off. When that happens I just switch sticks. I bring three different sticks to my games now, and switch between depending on how the game is playing out.
Another issue is with one timers. The softer the blade, the more tricky it is to get off a good one timer. Not big slap shot type one timers, but the quick pass and snap in close type. Softer blades make for more flubs. But like I said pick a stick model with the stiffer blade and that issue goes away.