I have notcied fluctuations at one time or another... depending on how much your armor decya (for evade) or your Fap is used (for paramedic) may also affect those skills. Also skills don't seem to be perfectly matching to the exact mob you hunt...there is some carryover. I did some long term tests at cp, and while the skill value increased at different intervals, the TT value seeemd to remain consistent. Every now and then I will get much more skill volume than I am able to explain.
As an example to what you may have notcied, if you use handgun, maybe your serendipity/coolness/combat sense improved a bit more than usual, compared to handgun skill (which would move slower if it were 7000 compared to 2,3,4000 of the other skills)
I did more research. (Warning, lots of numbers to follow but I'll try to sumerize. I put them so people can show where I'm wrong
)
I hunted Molisk first:
600 PED of ammo, total skills at start 121082 and at end 121231 for a total of 149 gain.
Than Argonauts:
600 PED of ammo total skills went from 121307 to 121402 for 95. Once again a sizable difference.
Now, the details. This is kind of messy as I can't cut-n-paste from excel to here cleanly but this is all the skills that changed on the Molisk hunt.
Health 155.58 Health 155.7 0.12
Alertness 3446.32 Alertness 3446.7 0.38
Athletics 4017.04 Athletics 4017.46 0.42
Coolness 3338.88 Coolness 3349.93 11.05
Courage 4237.54 Courage 4240.91 3.37
Dexterity 3685.45 Dexterity 3691.11 5.66
Perception 3357.24 Perception 3357.73 0.49
Serendipity 4089.93 Serendipity 4099.85 9.92
Aim 4712.66 Aim 4715.41 2.75
Combat Reflexes 4423.93 Combat Reflexes 4426.01 2.08
Combat Sense 1804.43 Combat Sense 1845.25 40.82
Inflict Ranged Damage 3959.59 Inflict Ranged Damage 3963.77 4.18
Marksmanship 5809.32 Marksmanship 5820.15 10.83
Ranged Damage Assessment 5101.45 Ranged Damage Assessment 5112.35 10.9
Rifle 6592.79 Rifle 6601.14 8.35
Weapons Handling 4801.66 Weapons Handling 4810.91 9.25
Avoidance 1370.8 Avoidance 1374.49 3.69
Evade 3669.83 Evade 3672.29 2.46
Anatomy 5834.39 Anatomy 5844.5 10.11
Diagnosis 1399.25 Diagnosis 1399.76 0.51
First Aid 2610.35 First Aid 2611.24 0.89
Medicine 212.56 Medicine 214.1 1.54
BLP Weaponry Technology 6484.57 BLP Weaponry Technology 6491.76 7.19
Psychotropy 256.07 Psychotropy 258.28 2.21
And on the Argo hunt:
Health 155.7 Health 155.76 Attributes 0.06
Alertness 3446.7 Alertness 3447.38 General 0.68
Athletics 4017.46 Athletics 4018.12 General 0.66
Coolness 3349.93 Coolness 3355.35 General 5.42
Courage 4240.91 Courage 4244.9 General 3.99
Dexterity 3691.11 Dexterity 3693.14 General 2.03
Perception 3357.73 Perception 3359.73 General 2
Serendipity 4099.85 Serendipity 4106.11 General 6.26
Aim 4715.41 Aim 4716.75 Combat 1.34
Combat Reflexes 4426.01 Combat Reflexes 4427.69 Combat 1.68
Combat Sense 1845.25 Combat Sense 1868.84 Combat 23.59
Inflict Ranged Damage 3963.77 Inflict Ranged Damage 3966.84 Combat 3.07
Marksmanship 5820.15 Marksmanship 5824.65 Combat 4.5
Ranged Damage Assessment 5112.35 Ranged Damage Assessment 5118.8 Combat 6.45
Rifle 6601.14 Rifle 6605.48 Combat 4.34
Weapons Handling 4810.91 Weapons Handling 4814.67 Combat 3.76
Avoidance 1374.49 Avoidance 1377.31 Defense 2.82
Evade 3672.29 Evade 3674.17 Defense 1.88
Anatomy 5844.5 Anatomy 5849.43 Medical 4.93
Diagnosis 1399.76 Diagnosis 1400.07 Medical 0.31
First Aid 2611.24 First Aid 2611.73 Medical 0.49
Medicine 214.1 Medicine 217.13 Medical 3.03
BLP Weaponry Technology 6491.76 BLP Weaponry Technology 6497.46 Construction 5.7
Concentration 93.81 Concentration 96.56 Mindforce 2.75
Psychotropy 258.28 Psychotropy 261.24 Mindforce 2.96
The last number is how much the change. So it's skill name, skill start, skill name, skill end, amount changed.
The main differences in hunting these two are 1 TP jump for Molisk and two after each death for Argo (so more concentration and Psychotropy for Argo, athough very little), the hunting area for Argo is more conducive for ranged weapons for theoretically I go hit less plus Argo hit rate is less than Molisk so more FAPing. As for cost, I have an Imp FAP so repair of the FAP is negligable and anyway, repair was roughly 90 PED on all trips (2 trips for each mob this time.)
I can't really think of any more info. It really does seem I gain more skills on the Molisks. I'm open to ideas and thoeries.
*Note, I'm not complaining about the Argo. After two 15k+ HoF this year they have treated me very well