HU rake considerations in split pot games

[THEjDonk]

I've played some HORSE (0.5/1) on Pokerstars lately. It seems like they rake a certain amount for every dollar that goes into the pot unless the pot gets big.

Let's say that you're playing stud8. You have a low hand on sixth street. You don't think your opponent is afraid of your board (no pair, mostly rainbow, but looking like a made low). He has an open pair of aces (let's assume that you think his most likely down cards are two small ones, so he can't have better than aces right now) and can't make a low hand. You have no outs to scoop. Would you be inclined to always check in this situation?

If we assume that our opponent will never fold, betting will just generate more rake. If we play against a very good opponent, he might realize that we wouldn't bet unless we had aces beat for high or were freerolling. He might not fold on sixth in that situation, but he might decide that aces are no good on seventh street if we fire again (or check sixth/bet seventh).

So what would you do? Would you never bet to keep the rake small, or are there certain opponents you would bet against to cover for the times you do have his high hand beat?

Remember that this is the smallest games on Pokerstars. Does this make you more inclined to check against typical opponents, or doesn't it matter much?