When lines are moving against you, win or lose, you aren't going to be profitable. Or substantially less so then you should be...
The main aspect(outside of money management) is to get the correct line. If you are repeatedly getting a lower line then the line when the game/event is going off you need to make some changes to the algorithm or simply the data you are entering into your algorithm.
Trump is going to be in the 300s come election day. If you think he is value just wait and bet it then. To continue to chase on bad lines is not a good strategy.
This is just simply sports betting advice, so please take it as such.
I agree with you generally speaking, crudebar.
As you well know though, at least in sports gambling , there is reverse line movement, which entices more bets even though the manner in which people
are betting would imply just the opposite.
eg Virtually everyone is betting the favorite say a football game is say 7 1/2,
But instead of going higher, the line moves down to 7 and possibly even 6 1/2.