Ay man I feel as clueless as you
Its a most queer feeling when nothing happens
A lot of times I have stacked and inhaled (one inhalation) 100mg 1:1 changa (=50mg spice) to absolutely no effect, whereas the same blend kicked my ass prior and then again after etc
I have no idea why it happens
I came to conclude that the molecule is intelligent, I know others will disagree, or that your brain could be so intuitive that it would mentally block whatever experience you could have received as a form of mental protection
Contemplate set and setting really deeply beforehand, and if it feels wrong DONT
I know you gave it breaks and all, but
Try and take a break until the day you completely forget about it, not once during the day did you think of hyperspace or contemplate other realms, focus on this reality and exist in it in a state of satisfaction.
Give it maybe another week, and try again.
This may take forever tho.... I still think about it everyday
With every great plan comes the pleasure of patience. Take a rest, and grab a suckle off the teat of life!