OP's Omega2 may have several issues, however a fundamental one needs to be addressed first:
it needs a good power supply.
His first attempt (LM1117-3.3 linear regulator) needs a heatsink. It also needs a 10uF input capacitor and 100uF output capacitor.
Omega2 consumes at least 250mA and has an impulse demand when WiFi section is turned on. Thus Omega2 needs to have a large capacitor in its Power_in side, thick "soldered" power supply wires throughout, and a good quality power supply (say 5V 2A then uses a 5V -> 3.3V switcher.)
His second attempt 5V-3.3V buck converter (MP1584 based) is a partial kit. That module needs to add a separate 22uF 6V output capacitor or it won't work. The seller simply cheaps out. It's a common practice over there.
With these fundamentals fully addressed, then that's the right time to tackle other potential issues.