bonuswhoring and game progress

[friends]

Let’s start with my goal, it is simple: 2BB/100h on three tables on 3/6 full ring fixed holdem. I think it will be on Party.
Because money from poker is significant part of my income, I find bonuswhoring is very attractive and now it’s going quite well, although my game quality is growing very, very slowly and 90% of my profit I get from bonuses. I think jumping from one site to another really hurts my winrate, cause the limits are not the same on all sites, and the game very often needs serious adjustment (by now I am winner on Prima (1/2), break even on Party, and absolutely destroyed by Stars). In addition to this I spend lots of time on finding lucrative propositions, claiming bonuses and dealing with deposits and cashouts (neteller, firepay, centralcoin and even moneybookers are not available for my country) and not on my game improving. I also started to notice that during the game I am eager not to win, but not to loose. So, now I really consider to switch entirely to Party and to concentrate on my long-term goal, spending more time on the game analyses and reading.
Perhaps, I am wrong and I am just weak player. Some players say, that game adjustment skill is the key to success on higher limits. That is why I created this post, and it would be very interesting for me to know your opinion: does bonuswhoring really slows the game progress, or this is only a mirage in my not well educated head?