Sonically wise I do not detect much difference between different tips as well. Seems to me that ASG2 isn't a much tip dependent IEM.
I've tried tips such as Audio Techinca, Sony hybrids, Meelec double flange, both single and double stock flanges.
To me, only subtle differences were noticed when switching between single and double flanges. I find single flange tips such as the Sony hybrid presents a slightly "boomier" bass. The stock double flange presented bass slightly more tightly and maybe slightly deeper. Soundstage was also only very marginally larger probably due to the further distance between tips and ear drum? Ain't sure of it too. But the differences are really subtle and definitely to me, comfort will be my deciding factor as the differences are really marginal or negligible.
I would say mid-range to me had a difference when paired with different after-market cables such as Fiio SPC, Chris 24AWG pure copper, Lune MKIII and Silver Dragon.
The mid-range was rendered much smoother, warmer and lush when paired with pure copper cable and Fiio SPC.
With the pure copper cable, bass was rendered tighter and deeper with less emphasis on mid bass. Vocals came out lush and upfront as though the singer is just right in front! Vocals details can be heard extremely well. Trade offs would be a slight deterioration in clarity but still surpassing the stock cable. Copper renders a really nice low end coupled with smooth, lush vocals. Definitely intrinsic for vocal lovers!
Fiio SPC rendered vocals on par with pure copper with slightly better clarity. Trade offs would be the low end. Bass isn't as punchy and quantitatively compared to pure copper but is still abundant and sufficient. For the price of the Fiio SPC, I think it is a great catch!
The Lune cable which utilizes silver cable wasn't my preferred type of signature. It renders vocals overly thin sounding for me though it enhances clarity and a tint of brightness which IMO, causes fatigue listening.
Silver Dragon cable would quite be a winner when paired with ASG2. It cleans up the spectrum bringing tighter, punchier and deeper lows. Vocals still were rendered smoothly though "not-so-in-your-face". Clarity was improved with good separation. Basically to me, the Silver Dragon pushed the ASG2 towards "balanced" though still not yet there.
I personally prefer Silver Dragon > Fiio SPC = Pure copper. But with the price of the Fiio SPC, I would gladly take it over the other three.