Not sure the ratio of 3:5 bonds for P. Cannot comment on your compound. There are many, many more intelligent people at this site than I. Hybridization of orbitals might come into play here. Perhaps someone can correct/add to what has been said so far?
I have a possible structure with the P in the middle, 3 Fs with single bonds to the P and two methyl groups, also attached to the P. If I am wrong or misleading you - don't mean to do so. Just that I haven't taken a chemistry course in over 3 decades!
Best of luck.
Steve