ok Ill go down the rabbit hole a bit,, even though I think you done a great job,, and with proper arrow it probably shoots great ,,,
as mentioned . the bottom limb may have not settled in,, but it is bending more at rest, ,making it difficult to judge the tiller,, so really the only way for me to feel good about it is shoot it ,,
or have some one you respect shoot it,,
that being said,, if you are unhappy,, taking some off the top limb is not gonna hurt it at all,,
and if it makes you feel like it is shooting better,, then great,, all your options are open and it should be a great bow,, nice save on the splinter,,
here is where I go down the rabbit hole,, it looks like you may be gripping the bow a bit hard, ,this could cause the thump you are experiencing,,try shooting with a loose grip,, proper string and arrow,, dont judge the bow till you have the proper string arrow and grip it likes,,
and I guess the poinit is,, how it is shooting trumps,, how you think the tiller looks,, on a stave bow,, the way the wood is bending can be decieving to the eye, but not how the arrow flys ..