I try to play tight, but I seem to be stuck around 25 % flops seen.
Now I wonder if there really is a point in being much tighter, as the tables I play usually have an average flop %-age of ~50 %. Once I read this statement: "Your goal is to be tighter, but only slightly tighter than your opponent." What do you think of this advice and what percentages do you have?

If there is not much raising at the table, only blind calls makes it 15 % if you call every other SB. Preflop raising must be an important factor. If there was a decent raise every time, I think I would play maybe 10 % of my hands.