Hertz - Any good Hertz discounts/CDPs working in BOSTON LOGAN?

I am trying to find a good Hertz CDP that provides a solid 30-40% off STD rates in Boston Logan Airport. My AMEX Centurion Card CDP and ABA CDP is giving me 16% off (which breaks down to about $40 per weekend day).

A month ago, I used both CDPs and got the rate discounted by 39%. The rate code was TMDE (which broke down to about $15 per weekend day)

I am wondering and hoping someone else found another CDP or PC that will still offer a similar rate at Boston Logan Airport.

Thanks.

How do you use 2 CDPs?

Travel Partner Club gives 20% but more than that is not typical on most CDPs.