This paper presents a catalogue-grounded weak-lensing response test within the ECSM framework using KiDS-1000 galaxy-galaxy lensing bandpowers and real 2dFLenS foreground-lens catalogues. Earlier ECSM KiDS tests used a LePhare-derived fallback burden proxy. Here that fallback is replaced with the actual foreground spectroscopic lens catalogues overlapping the KiDS fields. Four 2dFLenS KiDS foreground catalogues are loaded, cleaned, and separated from their associated random catalogues, giving 29,263 real foreground lenses across two redshift bins. From these catalogues, the analysis constructs foreground number, FKP-weighted, density, and concentration burden descriptors, combines them with KiDS lens-source geometry and a domain-boundary-gradient response term, and tests whether these physically motivated drivers predict the KiDS-1000 galaxy-galaxy lensing bandpower vector better than null, constant, and smooth power-law controls. The best full-data ECSM model is the combined weighted foreground-burden and domain-response model. It gives chi-squared 134.37 for 80 bandpower points and two fitted response parameters, improving strongly over both the zero model and the smooth power-law control. Held-out source-bin validation remains stable, with positive improvement in all source-bin folds. Held-out lens-bin validation is stricter and less stable, as expected for only two lens bins, but the real 2dFLenS weighted-burden projection gives the best held-out lens-bin performance among the tested ECSM and control models. These results do not constitute a full first-principles shear-map calculation or a replacement for standard cosmological inference. They do, however, provide a clean catalogue-level test showing that a real foreground-lens burden descriptor, combined with lens-source geometry and a finite-response domain-gradient term, carries strong predictive structure for the KiDS-1000 galaxy-galaxy lensing bandpower vector.
Adam Sheldrick (Sun,) studied this question.