Sorry, but no one here will be able to offer good advise to tweak your fit. You need to start from the beginning and do some self-education on fitting specific to the type of riding you do. Lots of already posted guidance for basic bicycle fitting online. Do a google search, watch videos, talk to techs at bike stores, others cyclists in person with your bike.
Specifically, you are contradictory in your query. If you can’t reach the hoods comfortably then the stem is not too short.
I don’t understand why you can’t lower the seat post or even if you need to, but if it’s too long get a shorter one or modify the one you have. If the frame is really on the small end of what you can fit, then you’ll want a seat post with a good deal of setback to get your position over the cranks right.
Get your position over the cranks set (height and setback) before adjusting the reach to the handlebars. Start with hoods level with bar tops and drops parallel to the ground. Tweak position from there.
Stop changing saddles until you get the basic fit setup. Start with saddle level and try small adjustments of up and down tilt to see what feels best.
Hand numbness is a symptom of so many issues, including your own general health and fitness. There are an unlimited number of things you can try to address numbness after you get a good basic bike fit.
Don't get frustrated, get smart about your bike fit. Then do only one adjustment at a time and evaluate before moving on.
Good luck!