I tried shooting carbon one time from a "self bow", think it caused a glitch in the Matrix...In all seriousness though, would help to know more info. Such as, bow draw weight at what draw length, your draw length, does the bow have a cut in shelf, etc. There are guys on here who have probably forgotten more about this subject than I know, but my guess is, unless that is an 80+ pound self bow, you're overspined. Spine weight and physical weight are 2 completely different things and while probably good to up the physical weight, adding that tip weight decreased the spine of the arrow. Not knowing measurements above, can't say if that was good or bad. As far as the broadhead question, yes, you will generally get better penetration from a cut on contact 2 blade than anything else. Get us some more info and I bet we get you straightened out,