Is the bendiness perhaps associated with a lack of bobstay?I have seen several tubular stainless DIY bowsprits tried, over the years, and most of them bent in service under the loads.
Below is a 'clip' from Selden's Yacht Mast manual showing their recommendations for DBS vs USL, for different RM and Displacements.
Note this is for T6062 alloy/tube diameters made by Selden. Tubes are available in same alloy, but different diameters and wall thickness.
They also make carbon bowsprits.
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Not sure this will/should get past the modsHere is my High tech prodder.
Gary
Thanks Ashtead,Hi Carlos -I have a Moody41ac which has a square box section bowsprit which fits in the bow roller . We had it bespoke made to fly the chute on a type of Karver furler. Hopefully the picture below assists but do send me a private message if more questions