Chespin was vastly more agreeable for me in finding out its base stats.
HP: 56 (Evidence 20 HP on 5 with no EVs went to 24 HP on 7 with no EVs. Once EVs applied, showed either at most 56. A 22 HP on 5(meaning at least 55) was actually one better, at 27 on 7)
ATK: 60-61...though I am fairly certain it is 61. (Evidence 11 strength bases showed some indication that 61 was max, 12 bases going to 14 on 6 indicated 60 min.) I am almost positive this is 61. This actually makes a lot of sense since I just realized both Froakie and Fennekin's SPATK were 61 base. They wanted all the first stages to have equivalent offensive capabilities. A noble task.
DEF: 65-66 (Every 11 defense on 5 was 14 by 7, indicating a min of 65. Unfortunately, I was never able to rule out 66. That being said, I only saw 2 13 defense stats on 5, out of a host of trials. If it was 66, I should see 1/8) I am leaning heavily towards 65.
SPATK: 45-46 (Was never able to rule 46 out, but this stat could start as 11, and I find that very likely to be 45.)
SPDEF: 42 (It took me so many trials because SPDEF is the one stat out of all the pokemon that didn't allow you to make any statements on level 6 alone. 9 never stayed 9 on level 6 and 10 never went to 12. Finally, I started leveling to 7 and seeing it on both ends, meaning it HAD to be 42)
SPEED: 38-39 (First stat that was base 8 without personality. I was able to rule out 35-37 by the 10 stats on level 5 through EV training. Never ruled out 38, but I only saw 8 base twice, much like defense.)
So my expected stat spread is 56/61/65/45/42/39 for a total of 308.
With what they did with the attacking prowess of each starter being equal, I am not surprised that Froakie ended up with a slightly higher total and Fennekin the lowest. Fennekin will likely end up making that up through evolution when the starters diverge a bit. Chespin in the middle also makes sense, as I think his attack as Chesnaught is slightly higher than Greninja's special attack.
Anyway, to sum up what I have done, this is what I will claim as the base stats:
Froakie - 40/56/40/61/43/70
Fennekin - 40/45/40/61/60/60
Chespin - 56/61/65/45/42/39