Sorry to say, but yes....pressure and angle are the culprits. Muscle memory from using carts for many years can be tough to break for some of us. I still regress at times. When you think you aren't using pressure, use even less.
Blades don't make as much of a difference as some folks think. There are differences, but not monumental. I like the Shark blades. I find them to be smooth and sharp, but not particularly long lasting. You could always go with a "fan favorite" such as Astra S/Ps, which are known to be petty sharp, yet smooth. At less than $10 for 100, they're a bargain. It's hard to go wrong with most any of the Russian offerings.
Early on I tried pre-shave oil. I never found that it did anything beneficial. Actually, some claim that oil affects the quality of the lather. If I remember correctly, Andrew
@Linuxguile and a couple of others tried Stirling pre-shave and did like it. Arko works just fine, and can produce a very slick lather...you just gotta put the water to it. Arko is very thirsty, especially if you're using a stick and use a generous amount. Proraso has Arko beat - hands down - in the postshave feel. Arko has the tendency to feel drying post-shave.
Just watch your angle and pressure - your shaves will certainly improve!

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