Many moons ago,I found for me,changing grips,using padding ect.,only prolonged the time before the suffering started.

99% of the time the problem was cured by moving the seat back and/or tilting the seat back.This shifts your CG back and takes weight off of your upper body that your hands need to support.You should be able to let go of the handlebars in your normal riding position and not bang your head on the stem.

You should be able to stay in that position ALL DAY LONG,high or low.If you have abs of steel,be a flat back rider.If you have an aero belly like me,I sit more upright to take advantage of it....

The thing with the chair or putting your legs against the wall and trying to pick something off the floor without falling over is a perfect example.Don't try this trick with women,you'll get a surprise at times.....Some women can do this,they carry their weight lower than men do.

The farther back your hiney is,the less weight on your hands but you give up some pedal power.The farther forward your hiney is,the more pedal power you have but you need a strong core to support your weight with just your hands if you want to be aero or put some TT bars on your tourer if your into flat back riding.

This is what works for me over the years.