I won't try pretending like I know what's best for you, or anyone for that matter, but I can relate my experience.
I train Muay Thai and lift as well. My biggest lesson is to not to try to do both in the same day. Especially lifting heavy, second. My CNS is just fried. I lose a good 20% off my 1RMs.
I train most of the time with lower reps and mid to high volume. 8x3, 5x5, and 5-3-2 waves being my favorites. I mix up strength lifts, fast/explosive lifts, and GGP type lifts.
Strength - deads, squats, etc. at high intensity
Fast/explosive - the olympic variants mostly for me
GPP type - farmer's walks, KB swings or snatches for time (EDT style), sandbag work, etc.
Works for me.
The best simple plan for a fighter that I heard was from Dan John. Deadlift and press everyday. Do about ten reps each, 5x2, 3x3, whatever. Just get really strong and build that base.
Finally, nothing adds raw power to your striking like deadlifting. Nothing.