All of the above and my 2 cents are cups in master are allowing fluid to bypass internally and won't necessarily leak externally, but cause the spongy feel. Also, the rear flex hose sounds like it is collapsed, causing the restricted flow and will expand under pressure, again can cause spongy pedal.
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Mitch
1970 Chevelle SS
1966 Chevelle SS
1967 Camaro ss/rs
1938 Business coupe, street rod
2000 FXSTS, original owner, 13k miles
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