They'd overlap only if they are different bonuses which are both applied to the roll, which was my point. The bonus DV probably either a reminder of the rule when it comes to Psi-Stab (since it's in a completely different section to the normal combat and action rules), or because Psi-Stab does not technically follow the bonus damage rule. This is a possible interpretation, as while the combat summary calls out Psi Attacks, Psi Assault isn't actually a combat skill. Psychic Stab is referred to as an attack, but you could make the argument it's not a normal attack roll (It's Psi Assault vs WIL x2). This is a little semantic-y for my taste, but a GM low-balling Psi could go with it. I mean, if you deliberately crash into someone with a vehicle, does that inflict bonus DV for an Excellent Success? Given the way the section is phrased and the curve on that damage, I'm pretty sure that's not Rules as Intended there. Given the similar curve on Psi Stab (even adding in Strong Mind later as a bonus), while it is genuinely possible that +15 might be the max bonus DV, and I'm not wholly opposed to the idea, it just doesn't sound right. "You get +5 bonus DV for getting an Excellent Success, and another +5 bonus DV for getting an excellent success".

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And the reason my Aptitude numbers aren't divisible by 5 is because Aptitude Points are expensive. :p

Right, but the default amount the game gives you evenly divides into divisibles by 5. And all NPCs and later CC methods (like Transhuman's alternates) are all divisible by 5. It's a real smooth fit for the percentiles. And, cost efficiency wise, buying just 2 points of SOM at creation is REALLY not worth it. For the equivalent value in credits you could get like +20 SOM worth in implants. But "Game Devs, why do you hate character advancement?" is a discussion for a seperate time.

Buying aptitude bonuses are not usually worth it. Morphs and augments can bestow aptitude bonuses for cheaper. Increasing an aptitude for your ego by 1 costs you 10 cp, but aptitude bonuses gained using the morph creation rules is can range from 1.5 to 2.125 cp a piece. You also get good mileage from augments, even as after purchase mods. Chances are you will be better off buying skill ranks instead of aptitude ranks. An aptitude increase by 1 costs as much as 10 skill ranks. Consider buying moxie instead as it can do a lot for your dice rolls when you need it. Remember, you should treat morphs as gear. Use what suits your needs. If your morph is no longer a good choice, consider switching morphs.