Well now Juece, i can see that you're more of a turtle style Vader. Only attacking when absolutely necessary and guaranteed. I used to be one myself in the early days of SC4 because that Force Parry just seemed too good.
Now what you can do to improve your style is to space more. Since you would rather defend and counter rather than being the aggresor, this is very important. Use 4B, 4K, FCA+B, 8WRA+B and even 236A+B if necessary to get your breathing room(no pun intended) If they get absolutely in your face, 1BA, A+G, and Force Parrys will be what saves you. Oh yeah, and don't forget to step. Vader's step is VERY good. Use it and run circles around your opponent.
DO NOT, i repeat, DO NOT SPAM FORCE PARRY IF YOU FEEL UNSAFE. One thing i noticed in our battles is that you were very aGI happy with that, so i waited til you GIed air and got myself a free combo. Here are a few options if you want to bait your opponent into an aGI: 4K, 6BB, 4B and WS2A. Of course these aren't guaranteed, but you can generally get most people with these baits. Just ask anybody i've played XD
Chances are though, with this style, you'll be getting A LOT of CF's, so throw in a splash 11B and you should be fine. Let me know how this works out. ;)