I prefer a 30" as well....I want something well balanced, but the longer sight plane over a 26" or 28" just feels better to me in an Over Under at around 8 to 8.5 lbs.... and longer helps smooth out my swing a little ( short and light gets to be "whippy"...)..and not smooth...
even an 8lb gun in 26" is just way too short for my liking....
I used to shoot 28" guns...but I just like the 30" more...
Its a subtle difference.../ but it isn't what feels right to me - its what feels right to you ...( shoot some 26", 28" and some 30" guns ...and note their respective weight ) and see how they feel to you.
a 7 or 7.5 lb gun in 30" doesn't feel right to me either...I need a little more weight...
Most 32" barreled guns...get up around 10 lbs ....and that's a little more weight than I like on a general purpose gun for Skeet or Sporting Clays or on live birds.... 32" to me, is more of a Trap gun.