You can swap [Seeker] for [Merciless Gunfight] for some nice Crit Damage Boost.
If Running Nourish Variant Swap [Pistol Pestilence] and [Frostbite] for ANY other mods you want, I personally run [Scorch] + [Accelerated Isotope] but you can run anything, heck you can run [Synth Charge] here, a faction mod, add a format and run [Hornet Strike], or a forma and run [Primed Heated Charge], [Galvanized Shot], etc.. the options are endless and you can have those 2 as flex slots for WHATEVER as long as you run Nourish