I can't vouch for the correct torque values you mention, but 29 lbs (assuming 29 ft. lbs.) seems very low for head bolts, so I'd start by checking those numbers. When a torque + angle is specified, you normally torque to the specification, then rotate the bolt an additional amount specified by the angle. Think of a compass. It has 360 degrees, broken up into four quadrants. Starting at North and moving clockwise, you are at 0 degrees. East is 90, South is 180, West is 270 and back up to North completes the 360 degrees. So, if your spec was 50 ft. lbs and 90 degrees, you'd torque to 50 ft. lbs. then remove the torque wrench and use a ratchet, placing the end of the handle at North. You'd then rotate the handle to East to get the 90 degrees. For 115, just go a little past East and you should be good. Remember that when torquing and head, manifold, etc., don't tighten each bolt to the final spec right away. Use the tightening sequence specified in the manual. This basically ensures that you don't warp or break the part, by tightening each bolt to a fraction of the final value, in a specific sequence, then repeating the process untill the final tightening.

As far as the RTV goes, my general approach is to use a liberal amount, but ensuring that no squeeze-out gets into the engine. Also make sure the RTV is the high temperature, safe for O2 sensor variety.