Numb hands help!

in Road general
Been riding for years but since getting a 2018 Supersix (old version) I’ve had real issues with hand numbness particularly in my left hand. The set up is very similar to my old Tarmac and I have tried all sorts of things to stop it occurring such as swapped bars, stem, bar tape, saddle height etc. From what I read it’s more likely to be a bike fit issue but as I say they geo and stack on the SS is similar to my Tarmac. I’ve tried lots of gloves but it makes no difference and have recently been deflating my front tyre to 90psi to see if that helps but to no avail. Do you guys think it might be the bike? The forks are quite a thin blade completed to the Tarmac.
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Giant Defy 4
There's also the Redshift stem although it's expensive:
https://road.cc/content/review/249893-redshift-sports-shockstop-suspension-stem
Good luck.
Put the skewers in from the wrong side but leave the nuts off so that you have the bare skewers projecting from the hubs. Place a metre rule on skewers and using a plumbline measure all the salient points. I would suggest using the rear hub, rather than the BB, as the datum point so that all the measurements are positive.
I switched from a CAAD12 to a tarmac and started to get some hand numbness. I replaced the saddle on the tarmac as I wasn't getting along with it, and I'm more comfy but also my hands are better as well.
Maybe the angles are different, or maybe that the old saddle was restricting blood flow.