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CRF Athena 280 jetting help needed. THX

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It's my first post here and I already need your help.

I put a 280 Athena kit on my 05 CRF 250 with a new head which was developped for the national outdoors (for a friend ), my exhaust is a Yoshimura.

Amazingly, I lost tons of low end but have incredibly strong and long top end.

The bike tends to bog when I land from scrubbed jump.

Let me tell you that those problems only appears when my friend (top 5 french MX2) use the bike, but I can feel that the low end are poor.

What is your proposition for the jetting of my bike?

Hope you could understand my poor english.

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