Shade sail supports at eaves end??

Actually perhaps more a query about the tie down strength of the top plate to rafter connection.
I'm about to put the large triangle shade sail over the front hip and I want to take it out over the wall and to the extent of the gutter. Rafters are old hardwood [ would have been 4" * 1 1/2" ] 900mm rafter spacing and the overhang is 450mm So the underlying structure probably exceeds the strength needed to comply with the span tables A34

I was going to block the ends with 45*90 H3 MGP12 and then bridge over with 90*120mm to give the 10mm coach screws something to bite into.
Before I go too far I just need to double check that a large "L" bracket in 3mm steel and held by a 10mm bolts used to connect the rafter to top plate and then top plate to studs is going to be strong enough to resist uplift forces. I'm reading from table 9.4 and making an assumption that the "L" bracket will be much stronger than the single framing anchor nominated in the table and strong enough to exceed the forces applied by the nominal maximum wind gust for the area taking into account the sail area.
Second part of the query, if it is too difficult to drill and bolt would #14 Bugles be strong enough if I increased the number of screws used from a single bolt to 2 bugles?
How much stronger is 2 * #14 bugles than the nominal fixing of 6 * 2.8mm framing nails?


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