I have a 50 footer and have a similar "slow flow" issue. The problem for me is simply. The long distance the water has to travel combined with the fact that draw and discharge points are almost at the same height lvl means me water pressure is powerful enough to cause a strong draw. My tank is about 35 feet from the kitchen sink I use. The tank sits a bit higher that counter height.
I have thought about making some type of rig with a impeller pump to increase draw pressure but not sure its worth the
If you have a flow regulator in you faucet (insert that fits inside the faucet end) usually has a plastic housing. Removing it can increase water flow out of the faucet. which would increase the suction slightly.