New PANS OPS, the procedures for designing holding patterns says that "All turns should be made at a bank angle of 25deg or at a rate of 3 deg/sec, which ever requires the lesser bank" it goes on to say "All prodedures depict tracks and pilots should attempt to maintain the track by making allowance for known wind by applying corrections to both heading and timing during entry and while flying in the holding pattern"
PANS OPS says nothing about varying bank angles, and so the people who design holding patterns / altitudes do not make any allowances for this!
These are the R&Rs; which techniques YOU want to adopt is up to you ;-)
(And yes, in a strong X-wind, I also vary my bank angles, but never more than 30deg to avoid vertigo etc...)