I just started shaving last week, and I ditched the Merkur blade that came with the razor because everyone complains about those blades. I picked up some Shark SS blades, and I have been using the same blade for 6 shaves now and I can't feel any pulling at all yet. What sort of "pulling" feeling do dull blades give? I just read about so many people getting 1-3 shaves per blade, and I've doubled that.
I'll admit that I'm not yet 19 and still have quite a few peach fuzzy hairs on my face instead of a full dark, hefty hair beard. The only part that I feel that the blade might not be sharp is when I go on my chin, but I only hear the hairs, I feel nothing. No rash afterwards, still BBS shaves since I got the technique down. I would find it hard to believe that I'm doing something WRONG, but I wouldn't venture too far to say I'm doing everything right.
Speaking of which, I think I've gotten my form down to get close to a BBS shave in 2 passes, which gives a bit less pain with alum afterwards.