After 2 days of break in, I would say I prefer the sound of capless mod over diymod with BG. To make it fair, I have made several comparison with 3 setups with similar amp and IEM, assuming the difference in interconnect cables would be minor and negligible.
diymod with BG to SE
iphd capless mod to SE
Iphd capless mod balanced
SE iphd mod is clearly more details, brighter, and airy and refined compared to diymod with BG, it is clearly a winner in detailed presentation. However for diymod with BG, it sounded laid back and warm. Would be good for relaxing and resting. One downside for diymod with BG is the sound is more blended. Imagine walking on the beach, the 'rocks' represent the music instrument placement are blended with sound and vocal as 'fine sand'. It is not as bad, but would be muddy.
With SE iphd mod, it is more like a rocky beach without sand. Every single notes are solid and clearly detailed. I would recommend to go for capless/ iphd capless mod and get rid of the capacitor.
iphd balanced sound however, with much more air and sound staging. Much upgrade from SE setup. It is a fun setup like sitting in a concert. For all, I would go straight to balanced setup if I have a balanced amp. Otherwise, SE capless is sufficient.
P/s: For iphd mod, using line out pads as hot pin and headphone pads as cold/ground sounded better compared to the opposite setup.