Armstrong Heritage Flute Serial Numbers

I am at a crossroads with my Armstrong Heritage flute ~1975.
It has the cursive Armstrong script with the block letters below and serial number H-3529. It has french pointed arms on the non-open holes of the body.
I do not see thin wall written on it. I bought this new in 1975. I am not happy with the head joint--it seems stiff in harsh, especially in the high register--seems to need a lot of air and air speed compared to the more silky higher register I have found with my Yamaha 471. I have had trouble finding a new head joint that fits--they are too big. The diameter of the barrel of my Heritage measures 20 mm.
What options do you suggest for a new headjoint that would fit and complement it? I assume trying to sell it 'as is' would fetch ~$500 and an overhaul seems hard to justify..
Also-it plays well--are new pads 'automatically' needed given its age?
Heritage
BY
ARMSTRONG
ELKHART
H-3529
Yamaha

Armstrong 104 Flute & Case - Elkhart, Indiana - Vintage Flute - Well-made W. Armstrong 104 Flute. A Fine addition for any collector. Seems to be in good working condition. In original case. Serial # 39 34191.

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