I think bp is far more useful than a tbow. My iron and main uses bp on everything that needs range but zulrah and cerb. Bp is faster kills than tbow on arma for sure consistently and you need it for minion kills tbow is just too slow for them imo. Tbow just hits too many zeros on arma. BP is almost as good on cerb and zulrah too but most imp is having the range pray. Do as many boss tasks as you can daily, add some reg slayer for increased key drops or pk if thats your thing. I do an hour or so of puro a week for arrows and darts. I get my food, havent cooked since 99, from keys and random barrows boss tasks. My iron used a dbow for zulrah until she got the bp. Dbow spec is pretty good. Tbow is absolutely wonderful on cerb and zulrah hands down never tried sires so cant comment there. Get fletch and craft up to make essential things such as arrows and zenyte jewlery. Row to autocollect keys and herbs so you can make brews and pots is also essential. The addition of rc will make irons have to spend less on runes. Getting max mage asap is also good to increase the damage when barraging at catacombs tasks.