The Loomis rod you mention is too light for that kind of fishing. I have an HS981 that is very similar to the 7'10" Loomis and it is way too "noodly".

I am in the market for the same type rod you are looking for but I want to build it so the calcutta is out (unless they start offering blanks and offer them in the Matte type finish). Right now I am using a Loomis HS932 which I like for 12 lb. but for 15 (or even 20) I'd like something fast and "beefier" but still lightweight (i.e., not Calstar).

There is a heavier/faster version of that St. Croix you mentioned that I may try. The blank number is GI80XHXF and the pre-built rod number is TC/TS80XHXF. Aside from the Calcutta and Loomis 9' saltwater rods it is the only 8', Extra-fast, all graphite rod I have found that has a line rating of 15 lb. and above. They also have a 7'10" Musky rod that may work also.

Check out the St. Croix website at: http://www.stcroixrods.com

I have never fished St. Croix but have heard decent things about them.

Here are a few I've come across:
St. Croix - GI80XHXF - 8' - 15-40 - Ex-Fast - $95
St. Croix - 2M710MXF - 7'10" - 14-30 - Ex-Fast - $78
Rainshadow - SWS597 - 7'10" - 15-30 - Fast - $65

The problem with the Rainshadow is that it is a composite blank (not full graphite) and the butt section is pretty thick (.900 compared to ~.650 like the others). I prefer to use the Fuji blank exposed triggers for extra sensitivity and they don't make any that would fit a .900 butt. It is also a slightly slower action.

Send me your e-mail address at leapinbass@yahoo.com and I'll send you a complete list of the research I have done so far in trying to find the right blank.