[Adger Smith]

Aubrey a little math:
3.19 1st gear to a 1.91 second is a 40% drop 7,000 - 40% =drop to 4,200
3.08 1st gear to a 1.91 second is a 38% drop 7,000-38% = drop to 4,340
after you get past the first gear:
1.91 second to a 1.32 3rd is a 30% drop 7,000 - 30% =drop to 4,900
1.32 3rd to a1 to 1 is a 24% drop 7,000-24% = drop to 5,320
you always want the % drop less as the gears go up. The 1.91 may have just a little too much drop with either the 3.19 or the 3.08 with your high torque engine it migh not. Either way I would try to work it from peak Tq to peak HP since it is not an RPM combination. This ain't your Dad's Small Block Chevy! That low gear will have to be determined by testing just how much "Hook" you really have.
When I ran a stick I kept 2 low gear ratios and 2 different weight flywheels to tune to track conditions and available "Hook"
Keep in mind that if you are crossing too high at the finish line you can always take a little rear gear out and add the starting line ratio back with low gear in the tranny.
More Math: pick your poison!
2.83 X 5.13 = 14.52 That you had trouble hooking @ 6,200 leave
3.19 X 5.13 = 16.37 Proably too low leaving at a high RPM
3.08 X 5.13 = 15.80 leave at just above peak Tq 4,300
3.19 X 4.88= 15.57
3.08 X 4.88 = 15.03
That is the beauty of using a stick. You can vary the leave RPM, clutch and gearing combos and do like Todd said, Drive it off the line!!
just my .02 for free!
Good luck.