Carrier frequency offset in Bell 103 FSK system
You actually haven't written a question here.

However, processing the signal samples you provided, I don't see CFO



I do see that the first symbol is way off frequency.

The Octave code that generated this picture is

% Octave requires an explcit load of the signal processing packasge, once.
pkg load signal

Fs = 8000; % sample rate
f1 = 1070;
f2 = 1270;

% Given input signal
x = [-2654, -7612, -3886, 7878, 11615, 3576, -7827, -8718, 2024, 10608, 7037, -4689, -10767, -3449, 7954, 9506, -268, -10213, -7943, 3860, 10379, 4329, -7315, -10597, -993, 9291, 8319, -1073, -8453, -9421, -3838, 4587, 9746, 8721, 2079, -6025, -10183, -7285, 543, 7892, 9928, 5577, -2463, -9105, -9553, -3460, 4873, 9778, 8289, 1465, -6545, -10267, -6913, 1409, 9233, 9670, 1549, -7870, -10014, -2476, 7280, 10301, 4253, -5740, -10644, -5449, 4735, 10329, 6648, -3054, -10283, -7899, 1853, 9598, 8580, -116, -9005, -9653, -1175, 8088, 9893, 4392, -3651, -9721, -9107, -2347, 5821, 9970, 7589, 329, -7404, -10201, -5967, 2302, 8859, 9547, 4147, -4083, -9749, -8730, -1712, 6344, 10047, 7267, -227, -7833, -10173, -4173, 5971, 10306, 5370, -4504, -10636, -6707, 3355, 10120, 7727, -1563, -9704, -8781, 437, 9021, 9372, 1417, -8025, -10149, -2603, 7177, 10249, 4220, -5744, -10668, -5861, 3143, 9068, 8965, 2886, -5287, -10183, -8154, -627, 7100, 9972, 6363, -1451, -8575, -9938, -4485, 3901, 9493, 8821, 2499, -5667, -10182, -7705, 6, 7571, 9986, 5825, -2953, -10279, -8524, 1050, 9229, 8920, 568, -8609, -9954, -1889, 7670, 10083, 3544, -6378, -10624, -4769, 5398, 10408, 6134, -3699, -10422, -7309, 2637, 9894, 8222, -642, -8674, -9449, -3731, 4583, 9831, 8655, 2073, -6095, -10210, -7331, 538, 7869, 9865, 5497, -2561, -9185, -9618, -3499, 4834, 9739, 8214, 1379, -6616, -10322, -6953, 1080, 8409, 9903, 3054, -6925, -10372, -4007, 6091, 10442, 5543, -4415, -10569, -6726, 3321, 10072, 7715, -1583, -9742, -8847, 336, 8928, 9332, 1383, -8081, -10213, -2681, 7110, 10289, 4978, -3519, -9480, -9000, -2202, 5933, 10045, 7614, 315, -7409, -10204, -5942, 2302, 8857, 9509, 4089, -4137, -9793, -8746, -1724, 6328, 10021, 7222, -275, -7838, -10123, -4857, 4825, 10468, 6696, -2987, -10231, -7801, 1940, 9661, 8653, -69, -8957, -9569, -1109, 8162, 9911, 2851, -6971, -10531, -4089, 5999, 10393, 5513, -4426, -10578, -6787, 2807, 9047, 8738, 2828, -5427, -10221, -8193, -622, 7121, 9974, 6362, -1471, -8559, -9908, -4432, 3953, 9537, 8864, 2520, -5641, -10149, -7648, 56, 7589, 9994, 5989, -2088, -9526, -9544, -573, 8418, 9480, 2021, -7641, -10408, -3409, 6581, 10342, 4891, -5077, -10617, -6097, 4070, 10274, 7276, -2246, -9966, -8345, 1145, 9352, 9059, 713, -8506, -10084, -3341, 4988, 9829, 8253, 1308, -6650, -10324, -6863, 1158, 8236, 9730, 4961, -3183, -9470, -9348, -2856, 5407, 9862, 7865, 757, -7108, -10304, -6431, 1743, 8569, 9581, 3392, -6440, -10648, -4769, 5371, 10406, 6074, -3750, -10452, -7322, 2604, 9869, 8181, -838, -9383, -9254, -389, 8576, 9648, 2108, -7540, -10389, -3403, 6571, 10352, 5141, -3853, -9537, -8504, -1471, 6542, 10119, 7243, -323, -7846, -10123, -5404, 2918, 9108, 9246, 3457, -4768, -10013, -8423, -1103, 6785, 10003, 6737, -959, -8269, -10056, -4821, 4225, 10333, 7837, -1482, -9649];

% Scale to between +/- 1.0 to avoid ridiculously large numbers on plots
xs = x/max(abs(x));

% Run through a Hilbert filter to make the signal analytic
xsc = hilbert(xs);

% FM demodulate using an approximate d(phi)/dt
y = arg(xsc(2:end) .* conj(xsc(1:(end-1))));
ys = y * (Fs/2)/pi;

% Plot the output of the FM discrimator
t = [1:length(ys)]/Fs;
f1line = ones(1, length(t))*f1;
f2line = ones(1, length(t))*f2;
plot(t, ys, t, f1line, t, f2line);
ylim([f1-300 f2+300]);
title('FM Discriminator Output');
xlabel('Time (seconds)');
ylabel('Frequency (Hz)');


By the way, the Octave/MatLab 'hilbert' implementation does a terrible thing - it zeros FFT bins to perform filtering - which should never be done in a real life, streaming Hilbert filter implementation.  Oppenheim and Schafer have a section in their textbook regarding practical Hilbert filters.