For those on here who may be able to advise, they would need to know which tube(s) types you are using. That is, are they 6S7 or 6922 or 12AX7 - there are different recommendations by type.
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Full/rich 12au7's in the Foreplay are:
RCA black plate (50's/60's)
RCA gray plate (50'/60's)
Sylvania BP (yellow print 50's/60's)
Sylvania GP (yellow print 50's/60's)
Still pretty full sounding, but with increased HF extension:
Amperex Orange Globe 12au7a/ecc82 (mine are really Mullards)
RCA 5814a white label (mine have 3 mica spacers)
GE's can also be good (nice & full), but they have been hit and miss from my collection (think the ones I like are actually RCA's branded GE).