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Had the leadpipes on both my tubas,bb flat yamaha neo and besson 981sovereign,unsodered from the bell by my repair tech in the great white north a little while ago.After playing for a while i found it to have neither a negative or positive impact on the way both horns played.What are peoples thoughts on getting this done?

When people test new/custom/replacement/etc. mouthpipes on various types of brass instruments, they are necessarily barely tacked in place, and there’s more of a sense of vibration in the mouthpipe.
Quite a few people (from advancing students to widely recognized professionals) have confused this tactile sensation with mistaken aural observations.
Congratulations to you for keeping the two separate.

With tubas and euphoniums in particular, adding this attachment requirement can eliminate as much of an as an inch of length from the overall length available for a given mouthpipe tube to be, and – if a particular mouthpiece might have been better an inch longer (with – as an example – the tuning slide an inch shorter), that option is lost - with a so-called elevated mouthpipe tube.
This requirement can also define that the receiver isn’t located as far around the bell as it could’ve been, which could define discomfort -when holding and playing a tuba or euphonium.