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Horizontal milling feeds for an FP2?

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I have been running some horizontal milling test cuts on my FP2. I have managed to dull a cutter or two in the process. I understand the FP2 is a lightweight compared to a 20hp horizontal mill. The feed calculations do not seem to take that into account, nor have I seen depth of cut taken into account. Maybe I have not read enough on it..

Doing the math on feeds and speeds I come up with the following:

HSS 2 inch 10 tooth cutter approx 1 1/2" wide running a 3/8" DOC
Low carbon mild steel (90 sfm)
Slab cutter (feed per tooth of .008).
= (90 x 12) / (2 x Pi) = 171 rpm
0.008 x 10 = 0.08 IPR
0.08 x 172 = 13.75 IPM

13 ipm seems way to fast of a feed. Even if I put the feed per tooth down to .002 I still get 3.4 ipm which I would expect might break something(?). Am I missing something here :nutter:? Is there an equation that factors the DOC, machine rigidity? Any rule of thumb for an FP2 with horizontal milling in steel?

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