You should never walk forward test with money management turned on. Walk forward tests should always be carried out with level stakes unless the money management is part of the strategy where position size is altered up and down based on some sort of trade risk calculation.

Personally I like to forward demo test with level stakes too because then I can easily compare like for like all the strategies on forward test. If one is good enough to go live then I would put it live with level stakes for a short while just to double check that it behaves itself before turning money management on to try to maximise returns.

Being in a rush to get rich can often lead to a rush towards being poor!