The smooth bore, or should I say smoother bore, hoses have a lining inside which is much more efficient than the old fashioned ones which would contract by a few feet when under load.
Last year, although I had an elderly decent smoothish bore hose on my Alltec Pro Plus, I bought an extra 7.5 mtrs of new hose from the little Piskey in Cornwall, the difference was quite noticeable.
The same goes for the solution line. I changed the elderly 300psi rated hose for a new 3000psi rated. In use, my guage showed an increase of 10psi
Safe and happy cleaning
Ken