With all due respect, I'm surprised that you found the KL Park lacking. I went there twice recently and saw lots of the big butterflies that Malaysia is known for: Rajah Brooke, Red and Blue Helen, Great Mormon, Troides Helena Ceberus and Great Orange Tip among others. These are the highlights for amateurs like me. I will never climb mountains and trek through jungles so these parks do me a great favour.
There were lots of butterflies when I was there and some were drunk on the fermented fruit juice. I love the Kepala Putih and Idea species too. Perhaps you went there on a bad day. Butterflies are seasonal after all.
Penang BF has fewer of these huge beauties but they take the trouble to exhibit the caterpillars, host plants and pupae, which is a chore.
I enjoy your posts and have learnt much from all of you. Thanks.