I operate a stain removal website and was wondering how consistent it was worth being from title tag to title tag. To give you an example, here is a group of keyword phrases that I might wish to target:

"getting out pet stains with vinegar"

"how do I remove water stains from wood"

"removing chocolate stains"

Does the benefit to be gained (whatever that might be) from making these consistently of the form "how to remove X from Y, " or "how to remove X" outweigh simply giving articles titles based on the exact phrases above?

I heard from someone that Google is getting more proficient at spotting "clumsy" title tags, although I'm not sure if any of the above examples would fall into that category, and was thinking that I should then probably proceed on the basis of directly titling articles based on the exact keywords I am uncovering...

Any advice much appreciated.

It helps with the theory, but some more specificity would help Are you saying 40-50 would be considered high demand/difficulty phrases? The problem is that I'm not finding much in the niches I'm targeting at around keyword difficulty 30...

I know that words in their 20's or 30's would be ideal, but it's proving hard for me to find relevant keywords with such scores (just a couple with scores in the 30's). Is going for words between 40-50 a waste of time?

Thanks.