Weight on the hands isn't the enemy. Improper support and position of hands with weight on them is. I like a long reach, so much so that I have been acquiring very long stems. Sometimes I have one on a bike that actually wants a little shorter, I I have done a few rides wit a little too much reach. The giveaway is sore elbows from having them too straight.

I hear a lot of "experts" extolling light grips on the handlebars for several different reasons. The veteran racers who coached me 40 years ago made it quite clear that I was to ride with a firm (but not hard) grip anytime I wasn't fully focused on the road ahead (and could see it) or the road surface was anything but good. That meant anytime I was following another rider, following a car, looking around, tired, spacey or just plain late in a ride. In other words, much of the time. Why? Because bad things happen when you hit road debris, potholes or cracks when you don't have a firm grip. Sometimes really bad things costing you weeks and months of training. Compared to the potential losses from that light touch, the penalty of a firm grip just doesn't seem so onerous.

Look at how straight your arms are and not just when you are starting out and fresh and have no trouble with the big bend forward. Look again when you are tired coming home. This can be a matter of too much reach. It may also change as you ride more and get more comfortable with the bend forward. YOu might want to raise the stem perhaps 1/2 cm. (I trust you didn't have the steerer cut down to no spacers on top. A common practice but not a smart one unless you really have your fit dialed in. (And don't plan to get injured or loose fitness.)

You might also look at the handlebar and brake lever setup. I consider those to be nearly as important as seat position. On a new setup, I go for rides with no handlebar tape except some electrical to keep the cables in place. Bring all the wrenches for my brake levers, bars and stem. When I have that close to dialed in, the first tape is cloth tape because you can peel it back, move the brake levers and re-wrap, as many times as you need to.

Hope you can get something from this. Happy riding!

Ben