My trip is coming in couple of months and it`s time to start thinking where to go.

This is what I have been thinking about:
MPM-DOH-HEL-xLHR-LAX-MIA-JFK-NRT-KUL-DPS-HKG-MLE-xDOH-xLHR-CPT

Some thoughts:

-There is direct flight from HEL to MIA but i would like to try AA77w from LHR and i can get AY a350 also from HEL. New CX first lounge is there also that i would love to try (I`am OW Emerald by then). How much you think it is going to raise price by going through LHR versus direct AY HEL-MIA?

-Is that ending from MLE valid? I know there is direct flights from DOH to CPT but i`am going to skip last leg and this way i could end up in London and go there with QR a380 from DOH. But is this backtracking?

I`am still figuring out how to get some nice beach locations there and might go SJU from MIA..

This is DONE ticket so i have gone through routes the way that i could get nice lounges, JAL J class, AA, QX and QR

Edit: More questions about the routes because I cant understand these even if i have read FAQ now 3 times

-Online tool for RTW gives error if i try to start from MPM and replicate my purchased trip. I can put starting point to CPT to avoid error (after that DOH-HEL) but then it says no flights between middle east and europe. But my ticket that have been issued already has MPM-DOH-HEL. Why it says that if i start from CPT and not MPM?

-I was playing with the RTW tool and figuring out would it be better to go around the globe opposite way that i have first thought so I made this routing:
MPM-DOH-HEL-NRT-KUL-DPS-HKG-LAX-MIA-.. and then i thought i had to go back to the Africa for my starting point, but it gives me options to flight LHR for stopover, then BCN for stopover and even back to Helsinki before going back to Africa. I thought i can`t come back to Europe if i have leave there once (i had stopover in DOH and HEL beginning of the trip). What is the rule that I don`t understand? (okey there might be many rules..