Millie,
It may be that continual use in the same bodypart, for some, may result in higher systemic levels of yohimbine, either due to saturation of the tissue, systemic build up or to A2 effects on blood flow.. ie when you apply it to the same area you get some systemic uptake from the second application and from the area where some remains, which is slowly being released(some reduced to 11-oh and some as yohimbine=more stimulatory/sides) as well, from initial application.
the fruit should help but if it does not we can look into designing a pattern for you that allows for more intensive use without the buildup.