Aryan Invasion/migration Theories & Debates -2

[HareKrishna]

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For 2-3 years i try to find the origin of R1a and IE languages.
From what i read until now will result this picture:
R1a originated in ex-Yugoslavia
in neolithic one group of R1a migrated from Yugoslavia in Ukraine stepe but it didnt find any good land there so he travel further for 300 days until they reach Afganistan ,Tadjikistan and Kashmir and finaly find some good agricultural land.
There formed a R1a nucleous and forming Bactria-Kashir economic complex .They either have the IE language from Balkans or learned this language from native populations(from near-by indians for exemple).
Then they spread east to India and west to Ukraine and Europe.
Is intersting that the newest theory about IE expansion is called Bactria theory.Bactria is a region from Afganistan and Tadjikistan.AMAIZING coincidence.

In Europe ,IE invaded first the Balkan area and next the Poland and Scandinavia following the climatic lineages of warm which go up to Scandinavia.The reason that Poland and Sweden have so much R1a is because it was sparsely populated comparatively whit Germany (as today Germany have a huge density population in Europe),it was at the border whit the stepe and it was in the plain.
The IE people have some problem to travel south trough Alps and Carpatian mountains so we observ a drop of R1a just like the iranian desert and big density of elamite populatin in west Iran stoped further advances of R1a in Iran.
Im not agree that is a sudden big drop o R1a in western Europe ,10-20 % of population whit R1a is still a big number .It look more like a step by step drop.

So what do you think? answer to all your questios?