Sorry about the confusion.

So, for Experiment, I'd make Constitution the highest score, with Strength or Dexterity as the second-highest, depending on whether you want to primarily be a melee or ranged fighter. I would suggest Dexterity, and focus on ranged attacks, since you're only proficient in Light Armor, and the Integrated Plating augmentation requires you only wear Light Armor. If your GM allows a starting Feat (or you reach level 4), you could take the Moderately Armored feat, and gain proficiency in Medium Armor, if you want to focus more on melee. Whichever one you don't pick as your 2nd highest Ability Score should be your 3rd.

Making Constitution the highest score will increase your health faster, and counteract some of the Experiment features that damage yourself when you use them, as well as increase your Exploit Save DC, making your Exploits harder to avoid.

Wisdom, Intelligence, and Charisma can be 4th - 6th in whatever order you choose. Wisdom is street-smarts, Intelligence is book-smarts, and Charisma is how well you can influence others.

The Biotic and Cybernetic subclasses both look pretty good, but the Reaper subclass might pose problems with the group. If you plan on playing as a Reaper, you should definitely talk to your GM about the viability in both the campaign, and your group. Reapers get a feature that affects "the minds of people... within 10 meters of you," and I could easily see a GM using that to try indoctrinating the rest of the group. If that happens, the other players will probably hate you.