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you have an incorrect model, transpiration is capillary action and evaporation from mesenchyme

xylem is not a straw, is no where near the diameter of a straw, and its[transpiration] is not about increased pressure its about decrease.

psi values at the apical mesenchyme are around -100 to -150 megapascals dependent on species and relative humidity at the stoma.

physics and biology although intertrined are not the same catechisms, heres a link toward most of m.j. canny's work.

here is is a basic scheme of things

Water Movement in Xylem:

Xylem:

Hydrogen bond: