According to my observations, you have a few options: 1) Remake the GRUNT Provisional: it obviously needs more boosters 2) Remake GRUNT 45. It\'s got enough power (remember, wasn\'t the mass of the lander like 44.9?) 3) Abandon the GRUNT series and use a mothership (don\'t do) BUT, there is one thing you MUST do. - Call up all the Kerbals who knows what GRUNT is about, even the ones that just LOOKED at the GRUNT 45 and get working. Next, call up the boys at the VAB who actually BUILT the two GRUNTs and squeeze every FINTOGRAM of data they have. Then, work with the modder who actually Modded the thing (which you already are) and exterminate the bugs. Finally, build the ultimate GRUNT once and for all.