Sweetness inconsistencies @ Gung Cha

Tried drinks from this branch and the one in Causeway and found that asking 50% strength in sweetness from both places, the taste is inconsistent in both branches.
The strength of sweetness at Wan Chai is not as sweet as Causeway Bay, I felt that Wan Chai’s 75% strength was equivalent to causeway bay’s 50% strength.

Drinks bought from this place: Green tea with red beans and toasted rice, Earl Grey milk tea with brown sugar jelly, Lemon with Wintermelon tea.
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Green tea with red beans and toasted rice:
The toasted rice was really nice, similar to eating rice crispie’s breakfast but not sweet, and the toasted aroma balanced out the green tea’s grassyness.

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Earl Grey: This was the most disappointing, because there was no earl grey flavour at all, it just tasted like the tea you would get in any Chinese café, basically hongkie styled tea!
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Lemon with Wintermelon tea: This was overly sweet, and it was made from concentrated lemon jam, so the drink tasted stronger than I would have liked. I was expecting a delicate light tea with wintermelon taste and slight hints of lemon.