Nevin #3 (a par 3) plays about 3.8 strokes in tournaments.
It is around 360' long with 20' elevation change gradual downhill.
80' off the tee is a 30' gap and then the hole opens to 50' wide all the way to the basket with no trees in the fairway. Dead nuts straight shot. It does not look narrow off the tee.
Nevin #12 Long (par 5) plays 6.75 strokes in tournament play. 950' with the first 500 a wide open field and the second 450 down a 50' wide wooded fairway.
Nevin #5 is a par 5 650' It averages 6.25 strokes per player in tournaments.
This has nothing to do with anything but Nevin 3L, 4, 5, 6 is the hardest stretch of holes in Charlotte (to par). On average, these holes play about 4 strokes over par(1 per hole). Should I make them a par 4, 5,6,4 instead of 3,4,5,3? to be more fair. If I made hole 3 a par 5... the average would still be 3.8 strokes per round.
There are two different items to look at when it comes to 'fair'.. 'par' being one of them, but just as important is the scoring distribution for the hole (not just the average). I haven't seen anything about the particular course you're talking about, but from your description it sounds like 3L is definitely correctly a par 3. By the PDGA guidelines for a Gold level course, a heavily-wooded hole (it sounds like that 30ft. gap makes the hole a lot tighter than it appears) can still be a par 3 at up to 450ft. At 360ft. with a 20ft. downhill, that particular hole probably 'plays' around 300ft. Next analysis is using CR Par: at the Gold level, the recommended accurate drive distance is 400ft., with a 100ft. range for a ~90% chance at putting out in two throws, for a total distance for a par 3 of 500ft. Once again, it sounds like this hole is fine as a par 3. Third analysis: intended number of drives. It sounds like the hole is designed essentially as a straight shot through a gap. That's one drive, followed by two putts, or again a par 3.
Next step, however, would be to look at the scoring distribution for Gold level players.. the goal being to have fewer than 70% of players (actual Gold-level players, with an average rating of 1000, mind you) scoring the same. If the scoring distribution is spread out enough, the hole sounds like it's well-designed. If it's not, well then it could probably use tweaking (typically the basket position) rather than a change in par.
Hole 12 is more interesting, though. At 950ft. (either lightly-wooded or heavily-wooded) the PDGA guideline is par 5. However by CR Par guidelines, you have an interesting problem. At 500ft. for the first drive, that's outside of the range of an accurate drive for the averaged Gold-level player. How short can a player be and still make the turn into the second fairway? If it can be hit after a 400ft. tee shot, great, but otherwise you're really talking about a 400ft. drive followed by a 100-150ft. upshot just to make the second fairway. Once in the second fairway, the CR Par guideline for accurate fairway drives is only 330ft. for Gold level players. So at 450ft. this is slightly outside a drive and the 100ft. putting range for a 90% chance at finishing out in two. So by CR Par guidelines, this sounds like it should be a par 6: 400ft. drive, followed by 100ft. upshot, followed by 330ft. fairway drive, followed by 120ft. upshot, followed by 2 putts.
I'd definitely be curious to see the scoring distribution for this one, though..
I'd need more information about the hole shape for hole 5 to say anything about that one.