Are there any tips to assist in reaching female ejaculation, such as gels/stimulants, tricks?

My wife and I have been trying for some time to be able to get her to the point of female ejaculation. We have tried G-spot stimulation for hours, curved "g-spot" toys, abdominal pressing with g-spot stimulation, different rhythms/patterns, combined clitoral/g-spot stimulation, anal/g-spot combined stimulation, etc. Yet nothing has worked. Does anyone have any pointers OTHER THAN what I have mentioned? It seems like we should have reached it already. Some of her orgasmic contractions are strong enough to nearly cut circulation off to my fingers... so I am curious what we are missing? (Yes, we always have a towel handy just in case... I have read that is a MUST when attempting). I am mainly curious if there is a vaginal/clitoral stimulant gel that would help? We have tried several but most just seem to be placebo in a sense. Any specific manual (fingers only) recommendations? Thanks!