I quite like these flags, they are well executed.
Some of the designs for some individuals seem 'uncluttered' for 15th Century banners (some of whose arms were sometimes divided in 1/8ths and 16ths - 15th Century banners went wild with showing who had married into who's family), but by and large they really look the part.
The 'strangled boye' on your 15th C. Vaughan arms should look a bit more like this;

rather than the Victorian looking cove with the side parting.
You might want to check your Stanley banners on the other sheet too, the Stanley's of Hooton were of a different branch to the Stanley's of Lathom (with somewhat different arms which included those of the Hooton family) and 'George Stanley' (Lord Strange), was of the Lathom branch.
Lord Stanley's arms are shown on the rear horse-trapping on this illustration and include his arms as 'King of Mann'.
His brother Sir William Stanley of Holt, should have arms similar to the lower right quarter of his brother's, with a label for difference (I think of the top of my head at least). This article might be of help and does it way better than me;
http://www.isle-of-man.com/manxnotebook/people/lords/mstalls.htm Almost all the rest, I haven't got a clue about, but they look damn impressive.
