"...thinking of keeping all my shares and trading in and out of the warrants when they might be cheap or expensive..."

Two annoying things that will plague many warrants while they are out of the money...

1. They will often have much less liquidity than the underlying share.

2. They will often have a larger bid/ask spread than the underlying share.

So trading in and out of the warrants might not be as easy as one might expect. But I think both of those factors tend to go away once a warrant is in the money.