I think you actually want lower flow and not higher. Since head loss in a given plumbing system is proportional to the square of flow, the more flow (GPM) you have, the more head loss or PSI you will have. 2 speed pumps or multi speed pumps allow you to reduce your flow and thus the friction loss in the piping. For example, on low speed of a 2 speed pump, your flow will reduce by 50% but your head loss will reduce by 75%. In addition, the pump current draw will be reduced by over 65%. So even though you have to run the pump twice as long for the same turnover, the energy savings is still over 30%. Going from a low efficency pump to a high efficeny 2 speed will give you even more savings.

Changing the pump to a 2 speed or multi-speed is an easy way to reduce your energy consumption. Changing your plumbing is much more difficult, expensive and unless you replace all of the piping in the pool, will not give your the results you are looking for.

Also, suction style cleaners requires the main pump to run on high which is expensive. Robotics are much more cost effective in the long run and actually clean much better.