Sonnetary Confinement

Ok - L7...the 'original' line was: "But Pyrrhus failed to comtemplate defeat", which if I'm correct, would have scanned reasonably well in ip - this was not not my intention :>  However, I'm not sufficiently experienced in the art of sonnetry (?) to transfer my dangerously sparse knowledge of theory (switching feet for effect) into practice, and I'd appreciate your scan of L7, so I know exactly what it is I've got in there :> (It was actually meant to go iamb/iamb/pyrrhus/spondee/iamb). The point of S2 L7 was to demonstrate how ineffectual an inconsistent foot can be when applied gratuitously or inappropriately. To me, L7 just sounds awkward. I also wondered whether L8 comprises iambs with a trochee thrown in ('pain in')
S3 was also meant to be somewhat self-deprecating (wow, I'm so clever) - ideally, the 'piss it' line would have been the last line in the quatrain, the culmination of a contrived variation on a scheme. 'Silly Bulls' is a slurpy suggestion, and so I'll have to consider something other than 'trailing' to accomodate the allusion.
The couplet - more of the same...traditionally/conventionally, the 'volta' would appear in L9 (?) - either the first line of the Petrarchan sestet, or the third quatrain of the English/Shakespearean (if at all), leaving the couplet in the latter as a kind of wrap up finale, so 'volta' wouldn't have any direct  relevance where I placed the reference. I know nothing about the 'modern' dynamics of the volta, so I guess that one turned on me, as many things seem to do when I exercise my mouth/fingers :>
This one exercised me, though not in an over-the-Hillary-barracking-Obama fashion...

'Arse' - yeah, right - I guess I was being terribly British in my projected pronunciation, so 'arse' is more than parsable   Thank you for being so gentle in your savagery *disorderly slime*