trichomes are more directly correlated to what you are looking for. This is why stigmata is not the best way to determine when to harvest. They are hair-like projections meant to collect pollen i the air. The trichomes are filled with THC you want and the color can tell you when it is starting to degrade (amber).
Since you still see clear trichomes, i'd suggest waiting longer. have you had new stigmata growth lately or is that the original layer? if original, definitely wait longer it has time. The breeder's advertised flower time is rarely accurate. If it is new growth, you have to weight benefits of slightly added yield to time and greater risk of microbial infection etc etc... try to scope ripe calyxes and not the newest hairy growth when judging trichomes.