maby its your Nut on top cut to low so you buzz up in the first 3 positions and or a High fret and low fret combos a horned fret yea whats that is that the sound it makes ?
It's not that complicated or precise. I'm guessing the guitar has a compound radius, right? If you pre-curve your replacement frets to a 12" radius, they'll have just a skosh of an overbend (which is good) and should hammer-in (or press-in) snugly to the board, to fit whatever the small increase in radius may exist. Then just level the frets, dress, etc. as normal. Sometimes it's good to NOT have an engineering background :)
If you don't know how to re-fret, take it to somebody who knows how. If you're intent on doing it yourself, buy some fret wire from Stew-mac or LMI or Dunlop or anywhere. There;s no use in messing with Gibson.
StewMac is a good source, but they're all about the same. The important consideration will be matching your existing frets in terms of height and width when you order.
Make sure the width of the frets is the same as what you've got on the guitar. As far as height goes, measure the existing frets and puchase the next size up, keeping in mind that you'll have to remove material in the leveling and crowning process.
If this is your first fret job, keep in mind there's a considerable investment in tools to make, besides just the frets themselves. If you plan on doing more down the road, then a partial refret like this is a good place to start. If not, then the investment in tools will far outstrip what a good repairman will charge to do the job for you.
Good luck... take it slow, you'll have a fun and satisfying experience.