I don't know if it's something I'd call a stuggle, but I've been working towards my personal Holy Grail (or white whale, possibly) of a super-saturated IPA that is loaded with massive hop flavor, with just enough bitterness for balance, and minimal (ideally no) vegetal/grassy flavors. While that may sound like NEIPA, even the best NEIPA's I've had don't quite seem to hit the target I'm shooting for - either flabby/flat-tasting from a complete lack of bitterness, or grassy and harsh (often both). Most don't come close to the level of hop oil flavor saturation that I've flirted with in my best batches.
Like I said, this is probably destined to be my white whale of brewing, but it's a fun journey nonetheless.