I have the wolff uncapured guide rod and the spring pack that has 17-23 lb springs.
The 23 lb spring definitely adds some to the weight to rack the slide, but my 29 shoots best (feels the best when I shoot it), with the 23 lb. I think its worth just buying the heaviest guide-rod and spring combo for your needs. Id shoot 21 pound spring for stock loads (155-180 grain) and 23 pound for reloads or (180 and up or hotter loads).
I haven't had any feed issues using 23 pound spring shooting umc 180 grain fmj or hornady xtp 180 and 200 jhp. Havent shot any 155 grain yet.
Ive kept the 23 pound spring in because I'm new to reloading and want to keep my set up consistant as far as feel of the gun.
My brass eject about half as far as the stock spring did. still have trouble finding them. I think 10mm brass dissolve on ground contact.
Hope this helps